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ClamAV is an open source (GPLv2) anti-virus toolkit.
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clamav/libclamav/pe.c

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/*
* Copyright (C) 2007-2008 Sourcefire, Inc.
*
* Authors: Alberto Wu, Tomasz Kojm
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#define _XOPEN_SOURCE 500
#include <stdio.h>
#if HAVE_STRING_H
#include <string.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <time.h>
#include <stdarg.h>
#include "cltypes.h"
#include "clamav.h"
#include "others.h"
#include "pe.h"
#include "petite.h"
#include "fsg.h"
#include "spin.h"
#include "upx.h"
#include "yc.h"
#include "aspack.h"
#include "wwunpack.h"
#include "unsp.h"
#include "scanners.h"
#include "str.h"
#include "execs.h"
#include "md5.h"
#include "mew.h"
#include "upack.h"
#include "matcher.h"
#include "matcher-hash.h"
#include "disasm.h"
#include "special.h"
#include "ishield.h"
#define DCONF ctx->dconf->pe
#define PE_IMAGE_DOS_SIGNATURE 0x5a4d /* MZ */
#define PE_IMAGE_DOS_SIGNATURE_OLD 0x4d5a /* ZM */
#define PE_IMAGE_NT_SIGNATURE 0x00004550
#define PE32_SIGNATURE 0x010b
#define PE32P_SIGNATURE 0x020b
#define optional_hdr64 pe_opt.opt64
#define optional_hdr32 pe_opt.opt32
#define UPX_NRV2B "\x11\xdb\x11\xc9\x01\xdb\x75\x07\x8b\x1e\x83\xee\xfc\x11\xdb\x11\xc9\x11\xc9\x75\x20\x41\x01\xdb"
#define UPX_NRV2D "\x83\xf0\xff\x74\x78\xd1\xf8\x89\xc5\xeb\x0b\x01\xdb\x75\x07\x8b\x1e\x83\xee\xfc\x11\xdb\x11\xc9"
#define UPX_NRV2E "\xeb\x52\x31\xc9\x83\xe8\x03\x72\x11\xc1\xe0\x08\x8a\x06\x46\x83\xf0\xff\x74\x75\xd1\xf8\x89\xc5"
#define UPX_LZMA1 "\x56\x83\xc3\x04\x53\x50\xc7\x03\x03\x00\x02\x00\x90\x90\x90\x55\x57\x56\x53\x83"
#define UPX_LZMA2 "\x56\x83\xc3\x04\x53\x50\xc7\x03\x03\x00\x02\x00\x90\x90\x90\x90\x90\x55\x57\x56"
#define EC32(x) le32_to_host(x) /* Convert little endian to host */
#define EC16(x) le16_to_host(x)
/* lower and upper bondary alignment (size vs offset) */
#define PEALIGN(o,a) (((a))?(((o)/(a))*(a)):(o))
#define PESALIGN(o,a) (((a))?(((o)/(a)+((o)%(a)!=0))*(a)):(o))
#define CLI_UNPSIZELIMITS(NAME,CHK) \
if(cli_checklimits(NAME, ctx, (CHK), 0, 0)!=CL_CLEAN) { \
free(exe_sections); \
return CL_CLEAN; \
}
#define CLI_UNPTEMP(NAME,FREEME) \
if(!(tempfile = cli_gentemp(ctx->engine->tmpdir))) { \
cli_multifree FREEME; \
return CL_EMEM; \
} \
if((ndesc = open(tempfile, O_RDWR|O_CREAT|O_TRUNC|O_BINARY, S_IRWXU)) < 0) { \
cli_dbgmsg(NAME": Can't create file %s\n", tempfile); \
free(tempfile); \
cli_multifree FREEME; \
return CL_ECREAT; \
}
#define CLI_TMPUNLK() if(!ctx->engine->keeptmp) { \
if (cli_unlink(tempfile)) { \
free(tempfile); \
return CL_EUNLINK; \
} \
}
#ifdef HAVE__INTERNAL__SHA_COLLECT
#define SHA_OFF do { ctx->sha_collect = -1; } while(0)
#define SHA_RESET do { ctx->sha_collect = sha_collect; } while(0)
#else
#define SHA_OFF do {} while(0)
#define SHA_RESET do {} while(0)
#endif
#define FSGCASE(NAME,FREESEC) \
case 0: /* Unpacked and NOT rebuilt */ \
cli_dbgmsg(NAME": Successfully decompressed\n"); \
close(ndesc); \
if (cli_unlink(tempfile)) { \
free(exe_sections); \
free(tempfile); \
FREESEC; \
return CL_EUNLINK; \
} \
free(tempfile); \
FREESEC; \
found = 0; \
upx_success = 1; \
break; /* FSG ONLY! - scan raw data after upx block */
#define SPINCASE() \
case 2: \
free(spinned); \
close(ndesc); \
if (cli_unlink(tempfile)) { \
free(exe_sections); \
free(tempfile); \
return CL_EUNLINK; \
} \
cli_dbgmsg("PESpin: Size exceeded\n"); \
free(tempfile); \
break; \
#define CLI_UNPRESULTS_(NAME,FSGSTUFF,EXPR,GOOD,FREEME) \
switch(EXPR) { \
case GOOD: /* Unpacked and rebuilt */ \
if(ctx->engine->keeptmp) \
cli_dbgmsg(NAME": Unpacked and rebuilt executable saved in %s\n", tempfile); \
else \
cli_dbgmsg(NAME": Unpacked and rebuilt executable\n"); \
cli_multifree FREEME; \
free(exe_sections); \
lseek(ndesc, 0, SEEK_SET); \
cli_dbgmsg("***** Scanning rebuilt PE file *****\n"); \
SHA_OFF; \
if(cli_magic_scandesc(ndesc, ctx) == CL_VIRUS) { \
close(ndesc); \
CLI_TMPUNLK(); \
free(tempfile); \
SHA_RESET; \
return CL_VIRUS; \
} \
SHA_RESET; \
close(ndesc); \
CLI_TMPUNLK(); \
free(tempfile); \
return CL_CLEAN; \
\
FSGSTUFF; \
\
default: \
cli_dbgmsg(NAME": Unpacking failed\n"); \
close(ndesc); \
if (cli_unlink(tempfile)) { \
free(exe_sections); \
free(tempfile); \
cli_multifree FREEME; \
return CL_EUNLINK; \
} \
cli_multifree FREEME; \
free(tempfile); \
}
#define CLI_UNPRESULTS(NAME,EXPR,GOOD,FREEME) CLI_UNPRESULTS_(NAME,(void)0,EXPR,GOOD,FREEME)
#define CLI_UNPRESULTSFSG1(NAME,EXPR,GOOD,FREEME) CLI_UNPRESULTS_(NAME,FSGCASE(NAME,free(sections)),EXPR,GOOD,FREEME)
#define CLI_UNPRESULTSFSG2(NAME,EXPR,GOOD,FREEME) CLI_UNPRESULTS_(NAME,FSGCASE(NAME,(void)0),EXPR,GOOD,FREEME)
#define DETECT_BROKEN_PE (DETECT_BROKEN && !ctx->corrupted_input)
struct offset_list {
uint32_t offset;
struct offset_list *next;
};
static void cli_multifree(void *f, ...) {
void *ff;
va_list ap;
free(f);
va_start(ap, f);
while((ff=va_arg(ap, void*))) free(ff);
va_end(ap);
}
struct vinfo_list {
uint32_t rvas[16];
unsigned int count;
};
static int versioninfo_cb(void *opaque, uint32_t type, uint32_t name, uint32_t lang, uint32_t rva) {
struct vinfo_list *vlist = (struct vinfo_list *)opaque;
cli_dbgmsg("versioninfo_cb: type: %x, name: %x, lang: %x, rva: %x\n", type, name, lang, rva);
vlist->rvas[vlist->count] = rva;
if(++vlist->count == sizeof(vlist->rvas) / sizeof(vlist->rvas[0]))
return 1;
return 0;
}
uint32_t cli_rawaddr(uint32_t rva, const struct cli_exe_section *shp, uint16_t nos, unsigned int *err, size_t fsize, uint32_t hdr_size)
{
int i, found = 0;
uint32_t ret;
if (rva<hdr_size) { /* Out of section EP - mapped to imagebase+rva */
if (rva >= fsize) {
*err=1;
return 0;
}
*err=0;
return rva;
}
for(i = nos-1; i >= 0; i--) {
if(shp[i].rsz && shp[i].rva <= rva && shp[i].rsz > rva - shp[i].rva) {
found = 1;
break;
}
}
if(!found) {
*err = 1;
return 0;
}
ret = rva - shp[i].rva + shp[i].raw;
*err = 0;
return ret;
}
/*
static int cli_ddump(int desc, int offset, int size, const char *file) {
int pos, ndesc, bread, sum = 0;
char buff[FILEBUFF];
cli_dbgmsg("in ddump()\n");
if((pos = lseek(desc, 0, SEEK_CUR)) == -1) {
cli_dbgmsg("Invalid descriptor\n");
return -1;
}
if(lseek(desc, offset, SEEK_SET) == -1) {
cli_dbgmsg("lseek() failed\n");
lseek(desc, pos, SEEK_SET);
return -1;
}
if((ndesc = open(file, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY, S_IRWXU)) < 0) {
cli_dbgmsg("Can't create file %s\n", file);
lseek(desc, pos, SEEK_SET);
return -1;
}
while((bread = cli_readn(desc, buff, FILEBUFF)) > 0) {
if(sum + bread >= size) {
if(write(ndesc, buff, size - sum) == -1) {
cli_dbgmsg("Can't write to file\n");
lseek(desc, pos, SEEK_SET);
close(ndesc);
cli_unlink(file);
return -1;
}
break;
} else {
if(write(ndesc, buff, bread) == -1) {
cli_dbgmsg("Can't write to file\n");
lseek(desc, pos, SEEK_SET);
close(ndesc);
cli_unlink(file);
return -1;
}
}
sum += bread;
}
close(ndesc);
lseek(desc, pos, SEEK_SET);
return 0;
}
*/
/*
void findres(uint32_t by_type, uint32_t by_name, uint32_t res_rva, cli_ctx *ctx, struct cli_exe_section *exe_sections, uint16_t nsections, uint32_t hdr_size, int (*cb)(void *, uint32_t, uint32_t, uint32_t, uint32_t), void *opaque)
callback based res lookup
by_type: lookup type
by_name: lookup name or (unsigned)-1 to look for any name
res_rva: base resource rva (i.e. dirs[2].VirtualAddress)
ctx, exe_sections, nsections, hdr_size: same as in scanpe
cb: the callback function executed on each successful match
opaque: an opaque pointer passed to the callback
the callback proto is
int pe_res_cballback (void *opaque, uint32_t type, uint32_t name, uint32_t lang, uint32_t rva);
the callback shall return 0 to continue the lookup or 1 to abort
*/
void findres(uint32_t by_type, uint32_t by_name, uint32_t res_rva, fmap_t *map, struct cli_exe_section *exe_sections, uint16_t nsections, uint32_t hdr_size, int (*cb)(void *, uint32_t, uint32_t, uint32_t, uint32_t), void *opaque) {
unsigned int err = 0;
uint32_t type, type_offs, name, name_offs, lang, lang_offs;
uint8_t *resdir, *type_entry, *name_entry, *lang_entry ;
uint16_t type_cnt, name_cnt, lang_cnt;
if (!(resdir = fmap_need_off_once(map, cli_rawaddr(res_rva, exe_sections, nsections, &err, map->len, hdr_size), 16)) || err)
return;
type_cnt = (uint16_t)cli_readint16(resdir+12);
type_entry = resdir+16;
if(!(by_type>>31)) {
type_entry += type_cnt * 8;
type_cnt = (uint16_t)cli_readint16(resdir+14);
}
while(type_cnt--) {
if(!fmap_need_ptr_once(map, type_entry, 8))
return;
type = cli_readint32(type_entry);
type_offs = cli_readint32(type_entry+4);
if(type == by_type && (type_offs>>31)) {
type_offs &= 0x7fffffff;
if (!(resdir = fmap_need_off_once(map, cli_rawaddr(res_rva + type_offs, exe_sections, nsections, &err, map->len, hdr_size), 16)) || err)
return;
name_cnt = (uint16_t)cli_readint16(resdir+12);
name_entry = resdir+16;
if(by_name == 0xffffffff)
name_cnt += (uint16_t)cli_readint16(resdir+14);
else if(!(by_name>>31)) {
name_entry += name_cnt * 8;
name_cnt = (uint16_t)cli_readint16(resdir+14);
}
while(name_cnt--) {
if(!fmap_need_ptr_once(map, name_entry, 8))
return;
name = cli_readint32(name_entry);
name_offs = cli_readint32(name_entry+4);
if((by_name == 0xffffffff || name == by_name) && (name_offs>>31)) {
name_offs &= 0x7fffffff;
if (!(resdir = fmap_need_off_once(map, cli_rawaddr(res_rva + name_offs, exe_sections, nsections, &err, map->len, hdr_size), 16)) || err)
return;
lang_cnt = (uint16_t)cli_readint16(resdir+12) + (uint16_t)cli_readint16(resdir+14);
lang_entry = resdir+16;
while(lang_cnt--) {
if(!fmap_need_ptr_once(map, lang_entry, 8))
return;
lang = cli_readint32(lang_entry);
lang_offs = cli_readint32(lang_entry+4);
if(!(lang_offs >>31)) {
if(cb(opaque, type, name, lang, res_rva + lang_offs))
return;
}
lang_entry += 8;
}
}
name_entry += 8;
}
return; /* FIXME: unless we want to find ALL types */
}
type_entry += 8;
}
}
static unsigned int cli_md5sect(fmap_t *map, struct cli_exe_section *s, unsigned char *digest) {
void *hashme;
cli_md5_ctx md5;
if (s->rsz > CLI_MAX_ALLOCATION) {
cli_dbgmsg("cli_md5sect: skipping md5 calculation for too big section\n");
return 0;
}
if(!s->rsz) return 0;
if(!(hashme=fmap_need_off_once(map, s->raw, s->rsz))) {
cli_dbgmsg("cli_md5sect: unable to read section data\n");
return 0;
}
cli_md5_init(&md5);
cli_md5_update(&md5, hashme, s->rsz);
cli_md5_final(digest, &md5);
return 1;
}
static void cli_parseres_special(uint32_t base, uint32_t rva, fmap_t *map, struct cli_exe_section *exe_sections, uint16_t nsections, size_t fsize, uint32_t hdr_size, unsigned int level, uint32_t type, unsigned int *maxres, struct swizz_stats *stats) {
unsigned int err = 0, i;
uint8_t *resdir;
uint8_t *entry, *oentry;
uint16_t named, unnamed;
uint32_t rawaddr = cli_rawaddr(rva, exe_sections, nsections, &err, fsize, hdr_size);
uint32_t entries;
if(level>2 || !*maxres) return;
*maxres-=1;
if(err || !(resdir = fmap_need_off_once(map, rawaddr, 16)))
return;
named = (uint16_t)cli_readint16(resdir+12);
unnamed = (uint16_t)cli_readint16(resdir+14);
entries = /*named+*/unnamed;
if (!entries)
return;
rawaddr += named*8; /* skip named */
/* this is just used in a heuristic detection, so don't give error on failure */
if(!(entry = fmap_need_off(map, rawaddr+16, entries*8))) {
cli_dbgmsg("cli_parseres_special: failed to read resource directory at:%lu\n", (unsigned long)rawaddr+16);
return;
}
oentry = entry;
/*for (i=0; i<named; i++) {
uint32_t id, offs;
id = cli_readint32(entry);
offs = cli_readint32(entry+4);
if(offs>>31)
cli_parseres( base, base + (offs&0x7fffffff), srcfd, exe_sections, nsections, fsize, hdr_size, level+1, type, maxres, stats);
entry+=8;
}*/
for (i=0; i<unnamed; i++, entry += 8) {
uint32_t id, offs;
if (stats->errors >= SWIZZ_MAXERRORS) {
cli_dbgmsg("cli_parseres_special: resources broken, ignoring\n");
return;
}
id = cli_readint32(entry)&0x7fffffff;
if(level==0) {
type = 0;
switch(id) {
case 4: /* menu */
case 5: /* dialog */
case 6: /* string */
case 11:/* msgtable */
type = id;
break;
case 16:
type = id;
/* 14: version */
stats->has_version = 1;
break;
case 24: /* manifest */
stats->has_manifest = 1;
break;
/* otherwise keep it 0, we don't want it */
}
}
if (!type) {
/* if we are not interested in this type, skip */
continue;
}
offs = cli_readint32(entry+4);
if(offs>>31)
cli_parseres_special(base, base + (offs&0x7fffffff), map, exe_sections, nsections, fsize, hdr_size, level+1, type, maxres, stats);
else {
offs = cli_readint32(entry+4);
rawaddr = cli_rawaddr(base + offs, exe_sections, nsections, &err, fsize, hdr_size);
if (!err && (resdir = fmap_need_off_once(map, rawaddr, 16))) {
uint32_t isz = cli_readint32(resdir+4);
uint8_t *str;
rawaddr = cli_rawaddr(cli_readint32(resdir), exe_sections, nsections, &err, fsize, hdr_size);
if (err || !isz || isz >= fsize || rawaddr+isz >= fsize) {
cli_dbgmsg("cli_parseres_special: invalid resource table entry: %lu + %lu\n",
(unsigned long)rawaddr,
(unsigned long)isz);
stats->errors++;
continue;
}
if ((id&0xff) != 0x09) /* english res only */
continue;
if((str = fmap_need_off_once(map, rawaddr, isz)))
cli_detect_swizz_str(str, isz, stats, type);
}
}
}
fmap_unneed_ptr(map, oentry, entries*8);
}
int cli_scanpe(cli_ctx *ctx)
{
uint16_t e_magic; /* DOS signature ("MZ") */
uint16_t nsections;
uint32_t e_lfanew; /* address of new exe header */
uint32_t ep, vep; /* entry point (raw, virtual) */
uint8_t polipos = 0;
time_t timestamp;
struct pe_image_file_hdr file_hdr;
union {
struct pe_image_optional_hdr64 opt64;
struct pe_image_optional_hdr32 opt32;
} pe_opt;
struct pe_image_section_hdr *section_hdr;
char sname[9], epbuff[4096], *tempfile;
uint32_t epsize;
ssize_t bytes, at;
unsigned int i, found, upx_success = 0, min = 0, max = 0, err, overlays = 0;
unsigned int ssize = 0, dsize = 0, dll = 0, pe_plus = 0, corrupted_cur;
int (*upxfn)(char *, uint32_t, char *, uint32_t *, uint32_t, uint32_t, uint32_t) = NULL;
char *src = NULL, *dest = NULL;
int ndesc, ret = CL_CLEAN, upack = 0, native=0;
size_t fsize;
uint32_t valign, falign, hdr_size, j;
struct cli_exe_section *exe_sections;
struct cli_matcher *md5_sect;
char timestr[32];
struct pe_image_data_dir *dirs;
struct cli_bc_ctx *bc_ctx;
fmap_t *map;
struct cli_pe_hook_data pedata;
#ifdef HAVE__INTERNAL__SHA_COLLECT
int sha_collect = ctx->sha_collect;
#endif
if(!ctx) {
cli_errmsg("cli_scanpe: ctx == NULL\n");
return CL_ENULLARG;
}
map = *ctx->fmap;
if(fmap_readn(map, &e_magic, 0, sizeof(e_magic)) != sizeof(e_magic)) {
cli_dbgmsg("Can't read DOS signature\n");
return CL_CLEAN;
}
if(EC16(e_magic) != PE_IMAGE_DOS_SIGNATURE && EC16(e_magic) != PE_IMAGE_DOS_SIGNATURE_OLD) {
cli_dbgmsg("Invalid DOS signature\n");
return CL_CLEAN;
}
if(fmap_readn(map, &e_lfanew, 58 + sizeof(e_magic), sizeof(e_lfanew)) != sizeof(e_lfanew)) {
cli_dbgmsg("Can't read new header address\n");
/* truncated header? */
if(DETECT_BROKEN_PE) {
if(ctx->virname)
*ctx->virname = "Heuristics.Broken.Executable";
return CL_VIRUS;
}
return CL_CLEAN;
}
e_lfanew = EC32(e_lfanew);
cli_dbgmsg("e_lfanew == %d\n", e_lfanew);
if(!e_lfanew) {
cli_dbgmsg("Not a PE file\n");
return CL_CLEAN;
}
if(fmap_readn(map, &file_hdr, e_lfanew, sizeof(struct pe_image_file_hdr)) != sizeof(struct pe_image_file_hdr)) {
/* bad information in e_lfanew - probably not a PE file */
cli_dbgmsg("Can't read file header\n");
return CL_CLEAN;
}
if(EC32(file_hdr.Magic) != PE_IMAGE_NT_SIGNATURE) {
cli_dbgmsg("Invalid PE signature (probably NE file)\n");
return CL_CLEAN;
}
if(EC16(file_hdr.Characteristics) & 0x2000) {
cli_dbgmsg("File type: DLL\n");
dll = 1;
} else if(EC16(file_hdr.Characteristics) & 0x01) {
cli_dbgmsg("File type: Executable\n");
}
switch(EC16(file_hdr.Machine)) {
case 0x0:
cli_dbgmsg("Machine type: Unknown\n");
break;
case 0x14c:
cli_dbgmsg("Machine type: 80386\n");
break;
case 0x14d:
cli_dbgmsg("Machine type: 80486\n");
break;
case 0x14e:
cli_dbgmsg("Machine type: 80586\n");
break;
case 0x160:
cli_dbgmsg("Machine type: R30000 (big-endian)\n");
break;
case 0x162:
cli_dbgmsg("Machine type: R3000\n");
break;
case 0x166:
cli_dbgmsg("Machine type: R4000\n");
break;
case 0x168:
cli_dbgmsg("Machine type: R10000\n");
break;
case 0x184:
cli_dbgmsg("Machine type: DEC Alpha AXP\n");
break;
case 0x284:
cli_dbgmsg("Machine type: DEC Alpha AXP 64bit\n");
break;
case 0x1f0:
cli_dbgmsg("Machine type: PowerPC\n");
break;
case 0x200:
cli_dbgmsg("Machine type: IA64\n");
break;
case 0x268:
cli_dbgmsg("Machine type: M68k\n");
break;
case 0x266:
cli_dbgmsg("Machine type: MIPS16\n");
break;
case 0x366:
cli_dbgmsg("Machine type: MIPS+FPU\n");
break;
case 0x466:
cli_dbgmsg("Machine type: MIPS16+FPU\n");
break;
case 0x1a2:
cli_dbgmsg("Machine type: Hitachi SH3\n");
break;
case 0x1a3:
cli_dbgmsg("Machine type: Hitachi SH3-DSP\n");
break;
case 0x1a4:
cli_dbgmsg("Machine type: Hitachi SH3-E\n");
break;
case 0x1a6:
cli_dbgmsg("Machine type: Hitachi SH4\n");
break;
case 0x1a8:
cli_dbgmsg("Machine type: Hitachi SH5\n");
break;
case 0x1c0:
cli_dbgmsg("Machine type: ARM\n");
break;
case 0x1c2:
cli_dbgmsg("Machine type: THUMB\n");
break;
case 0x1d3:
cli_dbgmsg("Machine type: AM33\n");
break;
case 0x520:
cli_dbgmsg("Machine type: Infineon TriCore\n");
break;
case 0xcef:
cli_dbgmsg("Machine type: CEF\n");
break;
case 0xebc:
cli_dbgmsg("Machine type: EFI Byte Code\n");
break;
case 0x9041:
cli_dbgmsg("Machine type: M32R\n");
break;
case 0xc0ee:
cli_dbgmsg("Machine type: CEE\n");
break;
case 0x8664:
cli_dbgmsg("Machine type: AMD64\n");
break;
default:
cli_dbgmsg("Machine type: ** UNKNOWN ** (0x%x)\n", EC16(file_hdr.Machine));
}
nsections = EC16(file_hdr.NumberOfSections);
if(nsections < 1 || nsections > 96) {
if(DETECT_BROKEN_PE) {
if(ctx->virname)
*ctx->virname = "Heuristics.Broken.Executable";
return CL_VIRUS;
}
if(!ctx->corrupted_input) {
if(nsections)
cli_warnmsg("PE file contains %d sections\n", nsections);
else
cli_warnmsg("PE file contains no sections\n");
}
return CL_CLEAN;
}
cli_dbgmsg("NumberOfSections: %d\n", nsections);
timestamp = (time_t) EC32(file_hdr.TimeDateStamp);
cli_dbgmsg("TimeDateStamp: %s", cli_ctime(&timestamp, timestr, sizeof(timestr)));
cli_dbgmsg("SizeOfOptionalHeader: %x\n", EC16(file_hdr.SizeOfOptionalHeader));
if (EC16(file_hdr.SizeOfOptionalHeader) < sizeof(struct pe_image_optional_hdr32)) {
cli_dbgmsg("SizeOfOptionalHeader too small\n");
if(DETECT_BROKEN_PE) {
if(ctx->virname)
*ctx->virname = "Heuristics.Broken.Executable";
return CL_VIRUS;
}
return CL_CLEAN;
}
at = e_lfanew + sizeof(struct pe_image_file_hdr);
if(fmap_readn(map, &optional_hdr32, at, sizeof(struct pe_image_optional_hdr32)) != sizeof(struct pe_image_optional_hdr32)) {
cli_dbgmsg("Can't read optional file header\n");
if(DETECT_BROKEN_PE) {
if(ctx->virname)
*ctx->virname = "Heuristics.Broken.Executable";
return CL_VIRUS;
}
return CL_CLEAN;
}
at += sizeof(struct pe_image_optional_hdr32);
/* This will be a chicken and egg problem until we drop 9x */
if(EC16(optional_hdr64.Magic)==PE32P_SIGNATURE) {
if(EC16(file_hdr.SizeOfOptionalHeader)!=sizeof(struct pe_image_optional_hdr64)) {
/* FIXME: need to play around a bit more with xp64 */
cli_dbgmsg("Incorrect SizeOfOptionalHeader for PE32+\n");
if(DETECT_BROKEN_PE) {
if(ctx->virname)
*ctx->virname = "Heuristics.Broken.Executable";
return CL_VIRUS;
}
return CL_CLEAN;
}
pe_plus = 1;
} else {
/*
either it's got a PE32_SIGNATURE or
we enable win9x compatibility in that we don't honor magic (see bb#119)
either way it's a 32bit thingy
*/
if(EC16(optional_hdr32.Magic) != PE32_SIGNATURE) {
if(!ctx->corrupted_input)
cli_warnmsg("Incorrect magic number in optional header\n");
if(DETECT_BROKEN_PE) {
if(ctx->virname)
*ctx->virname = "Heuristics.Broken.Executable";
return CL_VIRUS;
}
cli_dbgmsg("9x compatibility mode\n");
}
}
if(!pe_plus) { /* PE */
if (EC16(file_hdr.SizeOfOptionalHeader)!=sizeof(struct pe_image_optional_hdr32)) {
/* Seek to the end of the long header */
at += EC16(file_hdr.SizeOfOptionalHeader)-sizeof(struct pe_image_optional_hdr32);
}
if(DCONF & PE_CONF_UPACK)
upack = (EC16(file_hdr.SizeOfOptionalHeader)==0x148);
vep = EC32(optional_hdr32.AddressOfEntryPoint);
hdr_size = EC32(optional_hdr32.SizeOfHeaders);
cli_dbgmsg("File format: PE\n");
cli_dbgmsg("MajorLinkerVersion: %d\n", optional_hdr32.MajorLinkerVersion);
cli_dbgmsg("MinorLinkerVersion: %d\n", optional_hdr32.MinorLinkerVersion);
cli_dbgmsg("SizeOfCode: 0x%x\n", EC32(optional_hdr32.SizeOfCode));
cli_dbgmsg("SizeOfInitializedData: 0x%x\n", EC32(optional_hdr32.SizeOfInitializedData));
cli_dbgmsg("SizeOfUninitializedData: 0x%x\n", EC32(optional_hdr32.SizeOfUninitializedData));
cli_dbgmsg("AddressOfEntryPoint: 0x%x\n", vep);
cli_dbgmsg("BaseOfCode: 0x%x\n", EC32(optional_hdr32.BaseOfCode));
cli_dbgmsg("SectionAlignment: 0x%x\n", EC32(optional_hdr32.SectionAlignment));
cli_dbgmsg("FileAlignment: 0x%x\n", EC32(optional_hdr32.FileAlignment));
cli_dbgmsg("MajorSubsystemVersion: %d\n", EC16(optional_hdr32.MajorSubsystemVersion));
cli_dbgmsg("MinorSubsystemVersion: %d\n", EC16(optional_hdr32.MinorSubsystemVersion));
cli_dbgmsg("SizeOfImage: 0x%x\n", EC32(optional_hdr32.SizeOfImage));
cli_dbgmsg("SizeOfHeaders: 0x%x\n", hdr_size);
cli_dbgmsg("NumberOfRvaAndSizes: %d\n", EC32(optional_hdr32.NumberOfRvaAndSizes));
dirs = optional_hdr32.DataDirectory;
} else { /* PE+ */
/* read the remaining part of the header */
if(fmap_readn(map, &optional_hdr32 + 1, at, sizeof(struct pe_image_optional_hdr64) - sizeof(struct pe_image_optional_hdr32)) != sizeof(struct pe_image_optional_hdr64) - sizeof(struct pe_image_optional_hdr32)) {
cli_dbgmsg("Can't read optional file header\n");
if(DETECT_BROKEN_PE) {
if(ctx->virname)
*ctx->virname = "Heuristics.Broken.Executable";
return CL_VIRUS;
}
return CL_CLEAN;
}
at += sizeof(struct pe_image_optional_hdr64) - sizeof(struct pe_image_optional_hdr32);
vep = EC32(optional_hdr64.AddressOfEntryPoint);
hdr_size = EC32(optional_hdr64.SizeOfHeaders);
cli_dbgmsg("File format: PE32+\n");
cli_dbgmsg("MajorLinkerVersion: %d\n", optional_hdr64.MajorLinkerVersion);
cli_dbgmsg("MinorLinkerVersion: %d\n", optional_hdr64.MinorLinkerVersion);
cli_dbgmsg("SizeOfCode: 0x%x\n", EC32(optional_hdr64.SizeOfCode));
cli_dbgmsg("SizeOfInitializedData: 0x%x\n", EC32(optional_hdr64.SizeOfInitializedData));
cli_dbgmsg("SizeOfUninitializedData: 0x%x\n", EC32(optional_hdr64.SizeOfUninitializedData));
cli_dbgmsg("AddressOfEntryPoint: 0x%x\n", vep);
cli_dbgmsg("BaseOfCode: 0x%x\n", EC32(optional_hdr64.BaseOfCode));
cli_dbgmsg("SectionAlignment: 0x%x\n", EC32(optional_hdr64.SectionAlignment));
cli_dbgmsg("FileAlignment: 0x%x\n", EC32(optional_hdr64.FileAlignment));
cli_dbgmsg("MajorSubsystemVersion: %d\n", EC16(optional_hdr64.MajorSubsystemVersion));
cli_dbgmsg("MinorSubsystemVersion: %d\n", EC16(optional_hdr64.MinorSubsystemVersion));
cli_dbgmsg("SizeOfImage: 0x%x\n", EC32(optional_hdr64.SizeOfImage));
cli_dbgmsg("SizeOfHeaders: 0x%x\n", hdr_size);
cli_dbgmsg("NumberOfRvaAndSizes: %d\n", EC32(optional_hdr64.NumberOfRvaAndSizes));
dirs = optional_hdr64.DataDirectory;
}
switch(pe_plus ? EC16(optional_hdr64.Subsystem) : EC16(optional_hdr32.Subsystem)) {
case 0:
cli_dbgmsg("Subsystem: Unknown\n");
break;
case 1:
cli_dbgmsg("Subsystem: Native (svc)\n");
native = 1;
break;
case 2:
cli_dbgmsg("Subsystem: Win32 GUI\n");
break;
case 3:
cli_dbgmsg("Subsystem: Win32 console\n");
break;
case 5:
cli_dbgmsg("Subsystem: OS/2 console\n");
break;
case 7:
cli_dbgmsg("Subsystem: POSIX console\n");
break;
case 8:
cli_dbgmsg("Subsystem: Native Win9x driver\n");
break;
case 9:
cli_dbgmsg("Subsystem: WinCE GUI\n");
break;
case 10:
cli_dbgmsg("Subsystem: EFI application\n");
break;
case 11:
cli_dbgmsg("Subsystem: EFI driver\n");
break;
case 12:
cli_dbgmsg("Subsystem: EFI runtime driver\n");
break;
case 13:
cli_dbgmsg("Subsystem: EFI ROM image\n");
break;
case 14:
cli_dbgmsg("Subsystem: Xbox\n");
break;
case 16:
cli_dbgmsg("Subsystem: Boot application\n");
break;
default:
cli_dbgmsg("Subsystem: ** UNKNOWN ** (0x%x)\n", pe_plus ? EC16(optional_hdr64.Subsystem) : EC16(optional_hdr32.Subsystem));
}
cli_dbgmsg("------------------------------------\n");
if (DETECT_BROKEN_PE && !native && (!(pe_plus?EC32(optional_hdr64.SectionAlignment):EC32(optional_hdr32.SectionAlignment)) || (pe_plus?EC32(optional_hdr64.SectionAlignment):EC32(optional_hdr32.SectionAlignment))%0x1000)) {
cli_dbgmsg("Bad virtual alignemnt\n");
if(ctx->virname)
*ctx->virname = "Heuristics.Broken.Executable";
return CL_VIRUS;
}
if (DETECT_BROKEN_PE && !native && (!(pe_plus?EC32(optional_hdr64.FileAlignment):EC32(optional_hdr32.FileAlignment)) || (pe_plus?EC32(optional_hdr64.FileAlignment):EC32(optional_hdr32.FileAlignment))%0x200)) {
cli_dbgmsg("Bad file alignemnt\n");
if(ctx->virname)
*ctx->virname = "Heuristics.Broken.Executable";
return CL_VIRUS;
}
fsize = map->len;
section_hdr = (struct pe_image_section_hdr *) cli_calloc(nsections, sizeof(struct pe_image_section_hdr));
if(!section_hdr) {
cli_dbgmsg("Can't allocate memory for section headers\n");
return CL_EMEM;
}
exe_sections = (struct cli_exe_section *) cli_calloc(nsections, sizeof(struct cli_exe_section));
if(!exe_sections) {
cli_dbgmsg("Can't allocate memory for section headers\n");
free(section_hdr);
return CL_EMEM;
}
valign = (pe_plus)?EC32(optional_hdr64.SectionAlignment):EC32(optional_hdr32.SectionAlignment);
falign = (pe_plus)?EC32(optional_hdr64.FileAlignment):EC32(optional_hdr32.FileAlignment);
if(fmap_readn(map, section_hdr, at, sizeof(struct pe_image_section_hdr)*nsections) != (int)(nsections*sizeof(struct pe_image_section_hdr))) {
cli_dbgmsg("Can't read section header\n");
cli_dbgmsg("Possibly broken PE file\n");
free(section_hdr);
free(exe_sections);
if(DETECT_BROKEN_PE) {
if(ctx->virname)
*ctx->virname = "Heuristics.Broken.Executable";
return CL_VIRUS;
}
return CL_CLEAN;
}
at += sizeof(struct pe_image_section_hdr)*nsections;
for(i = 0; falign!=0x200 && i<nsections; i++) {
/* file alignment fallback mode - blah */
if (falign && section_hdr[i].SizeOfRawData && EC32(section_hdr[i].PointerToRawData)%falign && !(EC32(section_hdr[i].PointerToRawData)%0x200)) {
cli_dbgmsg("Found misaligned section, using 0x200\n");
falign = 0x200;
}
}
hdr_size = PESALIGN(hdr_size, valign); /* Aligned headers virtual size */
for(i = 0; i < nsections; i++) {
strncpy(sname, (char *) section_hdr[i].Name, 8);
sname[8] = 0;
exe_sections[i].rva = PEALIGN(EC32(section_hdr[i].VirtualAddress), valign);
exe_sections[i].vsz = PESALIGN(EC32(section_hdr[i].VirtualSize), valign);
exe_sections[i].raw = PEALIGN(EC32(section_hdr[i].PointerToRawData), falign);
exe_sections[i].rsz = PESALIGN(EC32(section_hdr[i].SizeOfRawData), falign);
exe_sections[i].chr = EC32(section_hdr[i].Characteristics);
exe_sections[i].urva = EC32(section_hdr[i].VirtualAddress); /* Just in case */
exe_sections[i].uvsz = EC32(section_hdr[i].VirtualSize);
exe_sections[i].uraw = EC32(section_hdr[i].PointerToRawData);
exe_sections[i].ursz = EC32(section_hdr[i].SizeOfRawData);
if (!exe_sections[i].vsz && exe_sections[i].rsz)
exe_sections[i].vsz=PESALIGN(exe_sections[i].ursz, valign);
if (exe_sections[i].rsz && fsize>exe_sections[i].raw && !CLI_ISCONTAINED(0, (uint32_t) fsize, exe_sections[i].raw, exe_sections[i].rsz))
exe_sections[i].rsz = fsize - exe_sections[i].raw;
cli_dbgmsg("Section %d\n", i);
cli_dbgmsg("Section name: %s\n", sname);
cli_dbgmsg("Section data (from headers - in memory)\n");
cli_dbgmsg("VirtualSize: 0x%x 0x%x\n", exe_sections[i].uvsz, exe_sections[i].vsz);
cli_dbgmsg("VirtualAddress: 0x%x 0x%x\n", exe_sections[i].urva, exe_sections[i].rva);
cli_dbgmsg("SizeOfRawData: 0x%x 0x%x\n", exe_sections[i].ursz, exe_sections[i].rsz);
cli_dbgmsg("PointerToRawData: 0x%x 0x%x\n", exe_sections[i].uraw, exe_sections[i].raw);
if(exe_sections[i].chr & 0x20) {
cli_dbgmsg("Section contains executable code\n");
if(exe_sections[i].vsz < exe_sections[i].rsz) {
cli_dbgmsg("Section contains free space\n");
/*
cli_dbgmsg("Dumping %d bytes\n", section_hdr.SizeOfRawData - section_hdr.VirtualSize);
ddump(desc, section_hdr.PointerToRawData + section_hdr.VirtualSize, section_hdr.SizeOfRawData - section_hdr.VirtualSize, cli_gentemp(NULL));
*/
}
}
if(exe_sections[i].chr & 0x20000000)
cli_dbgmsg("Section's memory is executable\n");
if(exe_sections[i].chr & 0x80000000)
cli_dbgmsg("Section's memory is writeable\n");
cli_dbgmsg("------------------------------------\n");
if (DETECT_BROKEN_PE && (!valign || (exe_sections[i].urva % valign))) { /* Bad virtual alignment */
cli_dbgmsg("VirtualAddress is misaligned\n");
if(ctx->virname)
*ctx->virname = "Heuristics.Broken.Executable";
free(section_hdr);
free(exe_sections);
return CL_VIRUS;
}
if (exe_sections[i].rsz) { /* Don't bother with virtual only sections */
if (exe_sections[i].raw >= fsize) { /* really broken */
cli_dbgmsg("Broken PE file - Section %d starts beyond the end of file (Offset@ %lu, Total filesize %lu)\n", i, (unsigned long)exe_sections[i].raw, (unsigned long)fsize);
free(section_hdr);
free(exe_sections);
if(DETECT_BROKEN_PE) {
if(ctx->virname)
*ctx->virname = "Heuristics.Broken.Executable";
return CL_VIRUS;
}
return CL_CLEAN; /* no ninjas to see here! move along! */
}
if(SCAN_ALGO && (DCONF & PE_CONF_POLIPOS) && !*sname && exe_sections[i].vsz > 40000 && exe_sections[i].vsz < 70000 && exe_sections[i].chr == 0xe0000060) polipos = i;
/* check MD5 section sigs */
md5_sect = ctx->engine->hm_mdb;
if((DCONF & PE_CONF_MD5SECT) && md5_sect) {
unsigned char md5_dig[16];
if(cli_hm_have_size(md5_sect, CLI_HASH_MD5, exe_sections[i].rsz) &&
cli_md5sect(map, &exe_sections[i], md5_dig) &&
cli_hm_scan(md5_dig, exe_sections[i].rsz, ctx->virname, md5_sect, CLI_HASH_MD5) == CL_VIRUS) {
if(cli_hm_scan(md5_dig, fsize, NULL, ctx->engine->hm_fp, CLI_HASH_MD5) != CL_VIRUS) {
free(section_hdr);
free(exe_sections);
return CL_VIRUS;
}
}
}
}
if (exe_sections[i].urva>>31 || exe_sections[i].uvsz>>31 || (exe_sections[i].rsz && exe_sections[i].uraw>>31) || exe_sections[i].ursz>>31) {
cli_dbgmsg("Found PE values with sign bit set\n");
free(section_hdr);
free(exe_sections);
if(DETECT_BROKEN_PE) {
if(ctx->virname)
*ctx->virname = "Heuristics.Broken.Executable";
return CL_VIRUS;
}
return CL_CLEAN;
}
if(!i) {
if (DETECT_BROKEN_PE && exe_sections[i].urva!=hdr_size) { /* Bad first section RVA */
cli_dbgmsg("First section is in the wrong place\n");
if(ctx->virname)
*ctx->virname = "Heuristics.Broken.Executable";
free(section_hdr);
free(exe_sections);
return CL_VIRUS;
}
min = exe_sections[i].rva;
max = exe_sections[i].rva + exe_sections[i].rsz;
} else {
if (DETECT_BROKEN_PE && exe_sections[i].urva - exe_sections[i-1].urva != exe_sections[i-1].vsz) { /* No holes, no overlapping, no virtual disorder */
cli_dbgmsg("Virtually misplaced section (wrong order, overlapping, non contiguous)\n");
if(ctx->virname)
*ctx->virname = "Heuristics.Broken.Executable";
free(section_hdr);
free(exe_sections);
return CL_VIRUS;
}
if(exe_sections[i].rva < min)
min = exe_sections[i].rva;
if(exe_sections[i].rva + exe_sections[i].rsz > max) {
max = exe_sections[i].rva + exe_sections[i].rsz;
overlays = exe_sections[i].raw + exe_sections[i].rsz;
}
}
}
free(section_hdr);
if(!(ep = cli_rawaddr(vep, exe_sections, nsections, &err, fsize, hdr_size)) && err) {
cli_dbgmsg("EntryPoint out of file\n");
free(exe_sections);
if(DETECT_BROKEN_PE) {
if(ctx->virname)
*ctx->virname = "Heuristics.Broken.Executable";
return CL_VIRUS;
}
return CL_CLEAN;
}
cli_dbgmsg("EntryPoint offset: 0x%x (%d)\n", ep, ep);
if(pe_plus) { /* Do not continue for PE32+ files */
free(exe_sections);
return CL_CLEAN;
}
epsize = fmap_readn(map, epbuff, ep, 4096);
/* Disasm scan disabled since it's now handled by the bytecode */
/* CLI_UNPTEMP("DISASM",(exe_sections,0)); */
/* if(disasmbuf((unsigned char*)epbuff, epsize, ndesc)) */
/* ret = cli_scandesc(ndesc, ctx, CL_TYPE_PE_DISASM, 1, NULL, AC_SCAN_VIR); */
/* close(ndesc); */
/* CLI_TMPUNLK(); */
/* free(tempfile); */
/* if(ret == CL_VIRUS) { */
/* free(exe_sections); */
/* return ret; */
/* } */
if(overlays) {
int overlays_sz = fsize - overlays;
if(overlays_sz > 0) {
ret = cli_scanishield(ctx, overlays, overlays_sz);
if(ret != CL_CLEAN) {
free(exe_sections);
return ret;
}
}
}
pedata.nsections = nsections;
pedata.ep = ep;
pedata.offset = 0;
memcpy(&pedata.file_hdr, &file_hdr, sizeof(file_hdr));
memcpy(&pedata.opt32, &pe_opt.opt32, sizeof(pe_opt.opt32));
memcpy(&pedata.opt64, &pe_opt.opt64, sizeof(pe_opt.opt64));
memcpy(&pedata.dirs, dirs, sizeof(pedata.dirs));
pedata.e_lfanew = e_lfanew;
pedata.overlays = overlays;
pedata.overlays_sz = fsize - overlays;
pedata.hdr_size = hdr_size;
/* Bytecode BC_PE_ALL hook */
bc_ctx = cli_bytecode_context_alloc();
if (!bc_ctx) {
cli_errmsg("cli_scanpe: can't allocate memory for bc_ctx\n");
return CL_EMEM;
}
cli_bytecode_context_setpe(bc_ctx, &pedata, exe_sections);
cli_bytecode_context_setctx(bc_ctx, ctx);
ret = cli_bytecode_runhook(ctx, ctx->engine, bc_ctx, BC_PE_ALL, map, ctx->virname);
if (ret == CL_VIRUS || ret == CL_BREAK) {
free(exe_sections);
cli_bytecode_context_destroy(bc_ctx);
return ret == CL_VIRUS ? CL_VIRUS : CL_CLEAN;
}
cli_bytecode_context_destroy(bc_ctx);
/* Attempt to detect some popular polymorphic viruses */
/* W32.Parite.B */
if(SCAN_ALGO && (DCONF & PE_CONF_PARITE) && !dll && epsize == 4096 && ep == exe_sections[nsections - 1].raw) {
const char *pt = cli_memstr(epbuff, 4040, "\x47\x65\x74\x50\x72\x6f\x63\x41\x64\x64\x72\x65\x73\x73\x00", 15);
if(pt) {
pt += 15;
if((((uint32_t)cli_readint32(pt) ^ (uint32_t)cli_readint32(pt + 4)) == 0x505a4f) && (((uint32_t)cli_readint32(pt + 8) ^ (uint32_t)cli_readint32(pt + 12)) == 0xffffb) && (((uint32_t)cli_readint32(pt + 16) ^ (uint32_t)cli_readint32(pt + 20)) == 0xb8)) {
*ctx->virname = "Heuristics.W32.Parite.B";
free(exe_sections);
return CL_VIRUS;
}
}
}
/* Kriz */
if(SCAN_ALGO && (DCONF & PE_CONF_KRIZ) && epsize >= 200 && CLI_ISCONTAINED(exe_sections[nsections - 1].raw, exe_sections[nsections - 1].rsz, ep, 0x0fd2) && epbuff[1]=='\x9c' && epbuff[2]=='\x60') {
enum {KZSTRASH,KZSCDELTA,KZSPDELTA,KZSGETSIZE,KZSXORPRFX,KZSXOR,KZSDDELTA,KZSLOOP,KZSTOP};
uint8_t kzs[] = {KZSTRASH,KZSCDELTA,KZSPDELTA,KZSGETSIZE,KZSTRASH,KZSXORPRFX,KZSXOR,KZSTRASH,KZSDDELTA,KZSTRASH,KZSLOOP,KZSTOP};
uint8_t *kzstate = kzs;
uint8_t *kzcode = (uint8_t *)epbuff + 3;
uint8_t kzdptr=0xff, kzdsize=0xff;
int kzlen = 197, kzinitlen=0xffff, kzxorlen=-1;
cli_dbgmsg("in kriz\n");
while(*kzstate!=KZSTOP) {
uint8_t op;
if(kzlen<=6) break;
op = *kzcode++;
kzlen--;
switch (*kzstate) {
case KZSTRASH: case KZSGETSIZE: {
int opsz=0;
switch(op) {
case 0x81:
kzcode+=5;
kzlen-=5;
break;
case 0xb8: case 0xb9: case 0xba: case 0xbb: case 0xbd: case 0xbe: case 0xbf:
if(*kzstate==KZSGETSIZE && cli_readint32(kzcode)==0x0fd2) {
kzinitlen = kzlen-5;
kzdsize=op-0xb8;
kzstate++;
op=4; /* fake the register to avoid breaking out */
cli_dbgmsg("kriz: using #%d as size counter\n", kzdsize);
}
opsz=4;
case 0x48: case 0x49: case 0x4a: case 0x4b: case 0x4d: case 0x4e: case 0x4f:
op&=7;
if(op!=kzdptr && op!=kzdsize) {
kzcode+=opsz;
kzlen-=opsz;
break;
}
default:
kzcode--;
kzlen++;
kzstate++;
}
break;
}
case KZSCDELTA:
if(op==0xe8 && (uint32_t)cli_readint32(kzcode) < 0xff) {
kzlen-=*kzcode+4;
kzcode+=*kzcode+4;
kzstate++;
} else *kzstate=KZSTOP;
break;
case KZSPDELTA:
if((op&0xf8)==0x58 && (kzdptr=op-0x58)!=4) {
kzstate++;
cli_dbgmsg("kriz: using #%d as pointer\n", kzdptr);
} else *kzstate=KZSTOP;
break;
case KZSXORPRFX:
kzstate++;
if(op==0x3e) break;
case KZSXOR:
if (op==0x80 && *kzcode==kzdptr+0xb0) {
kzxorlen=kzlen;
kzcode+=+6;
kzlen-=+6;
kzstate++;
} else *kzstate=KZSTOP;
break;
case KZSDDELTA:
if (op==kzdptr+0x48) kzstate++;
else *kzstate=KZSTOP;
break;
case KZSLOOP:
if (op==kzdsize+0x48 && *kzcode==0x75 && kzlen-(int8_t)kzcode[1]-3<=kzinitlen && kzlen-(int8_t)kzcode[1]>=kzxorlen) {
*ctx->virname = "Heuristics.W32.Kriz";
free(exe_sections);
return CL_VIRUS;
}
cli_dbgmsg("kriz: loop out of bounds, corrupted sample?\n");
kzstate++;
}
}
}
/* W32.Magistr.A/B */
if(SCAN_ALGO && (DCONF & PE_CONF_MAGISTR) && !dll && (nsections>1) && (exe_sections[nsections - 1].chr & 0x80000000)) {
uint32_t rsize, vsize, dam = 0;
vsize = exe_sections[nsections - 1].uvsz;
rsize = exe_sections[nsections - 1].rsz;
if(rsize < exe_sections[nsections - 1].ursz) {
rsize = exe_sections[nsections - 1].ursz;
dam = 1;
}
if(vsize >= 0x612c && rsize >= 0x612c && ((vsize & 0xff) == 0xec)) {
int bw = rsize < 0x7000 ? rsize : 0x7000;
char *tbuff;
if((tbuff = fmap_need_off_once(map, exe_sections[nsections - 1].raw + rsize - bw, 4096))) {
if(cli_memstr(tbuff, 4091, "\xe8\x2c\x61\x00\x00", 5)) {
*ctx->virname = dam ? "Heuristics.W32.Magistr.A.dam" : "Heuristics.W32.Magistr.A";
free(exe_sections);
return CL_VIRUS;
}
}
} else if(rsize >= 0x7000 && vsize >= 0x7000 && ((vsize & 0xff) == 0xed)) {
int bw = rsize < 0x8000 ? rsize : 0x8000;
char *tbuff;
if((tbuff = fmap_need_off_once(map, exe_sections[nsections - 1].raw + rsize - bw, 4096))) {
if(cli_memstr(tbuff, 4091, "\xe8\x04\x72\x00\x00", 5)) {
*ctx->virname = dam ? "Heuristics.W32.Magistr.B.dam" : "Heuristics.W32.Magistr.B";
free(exe_sections);
return CL_VIRUS;
}
}
}
}
/* W32.Polipos.A */
while(polipos && !dll && nsections > 2 && nsections < 13 && e_lfanew <= 0x800 && (EC16(optional_hdr32.Subsystem) == 2 || EC16(optional_hdr32.Subsystem) == 3) && EC16(file_hdr.Machine) == 0x14c && optional_hdr32.SizeOfStackReserve >= 0x80000) {
uint32_t jump, jold, *jumps = NULL;
uint8_t *code;
unsigned int xsjs = 0;
if(exe_sections[0].rsz > CLI_MAX_ALLOCATION) break;
if(!exe_sections[0].rsz) break;
if(!(code=fmap_need_off_once(map, exe_sections[0].raw, exe_sections[0].rsz))) break;
for(i=0; i<exe_sections[0].rsz - 5; i++) {
if((uint8_t)(code[i]-0xe8) > 1) continue;
jump = cli_rawaddr(exe_sections[0].rva+i+5+cli_readint32(&code[i+1]), exe_sections, nsections, &err, fsize, hdr_size);
if(err || !CLI_ISCONTAINED(exe_sections[polipos].raw, exe_sections[polipos].rsz, jump, 9)) continue;
if(xsjs % 128 == 0) {
if(xsjs == 1280) break;
if(!(jumps=(uint32_t *)cli_realloc2(jumps, (xsjs+128)*sizeof(uint32_t)))) {
free(exe_sections);
return CL_EMEM;
}
}
j=0;
for(; j<xsjs; j++) {
if(jumps[j]<jump) continue;
if(jumps[j]==jump) {
xsjs--;
break;
}
jold=jumps[j];
jumps[j]=jump;
jump=jold;
}
jumps[j]=jump;
xsjs++;
}
if(!xsjs) break;
cli_dbgmsg("Polipos: Checking %d xsect jump(s)\n", xsjs);
for(i=0;i<xsjs;i++) {
if(!(code = fmap_need_off_once(map, jumps[i], 9))) continue;
if((jump=cli_readint32(code))==0x60ec8b55 || (code[4]==0x0ec && ((jump==0x83ec8b55 && code[6]==0x60) || (jump==0x81ec8b55 && !code[7] && !code[8])))) {
*ctx->virname = "Heuristics.W32.Polipos.A";
free(jumps);
free(exe_sections);
return CL_VIRUS;
}
}
free(jumps);
break;
}
/* Trojan.Swizzor.Gen */
if (SCAN_ALGO && (DCONF & PE_CONF_SWIZZOR) && nsections > 1 && fsize > 64*1024 && fsize < 4*1024*1024) {
if(dirs[2].Size) {
struct swizz_stats *stats = cli_calloc(1, sizeof(*stats));
unsigned int m = 1000;
ret = CL_CLEAN;
if (!stats)
ret = CL_EMEM;
else {
cli_parseres_special(EC32(dirs[2].VirtualAddress), EC32(dirs[2].VirtualAddress), map, exe_sections, nsections, fsize, hdr_size, 0, 0, &m, stats);
if ((ret = cli_detect_swizz(stats)) == CL_VIRUS) {
*ctx->virname = "Heuristics.Trojan.Swizzor.Gen";
}
free(stats);
}
if (ret != CL_CLEAN) {
free(exe_sections);
return ret;
}
}
}
/* !!!!!!!!!!!!!! PACKERS START HERE !!!!!!!!!!!!!! */
corrupted_cur = ctx->corrupted_input;
ctx->corrupted_input = 2; /* caller will reset on return */
/* UPX, FSG, MEW support */
/* try to find the first section with physical size == 0 */
found = 0;
if(DCONF & (PE_CONF_UPX | PE_CONF_FSG | PE_CONF_MEW)) {
for(i = 0; i < (unsigned int) nsections - 1; i++) {
if(!exe_sections[i].rsz && exe_sections[i].vsz && exe_sections[i + 1].rsz && exe_sections[i + 1].vsz) {
found = 1;
cli_dbgmsg("UPX/FSG/MEW: empty section found - assuming compression\n");
break;
}
}
}
/* MEW support */
if (found && (DCONF & PE_CONF_MEW) && epsize>=16 && epbuff[0]=='\xe9') {
uint32_t fileoffset;
char *tbuff;
fileoffset = (vep + cli_readint32(epbuff + 1) + 5);
while (fileoffset == 0x154 || fileoffset == 0x158) {
uint32_t offdiff, uselzma;
cli_dbgmsg ("MEW: found MEW characteristics %08X + %08X + 5 = %08X\n",
cli_readint32(epbuff + 1), vep, cli_readint32(epbuff + 1) + vep + 5);
if(!(tbuff = fmap_need_off_once(map, fileoffset, 0xb0)))
break;
if (fileoffset == 0x154) cli_dbgmsg("MEW: Win9x compatibility was set!\n");
else cli_dbgmsg("MEW: Win9x compatibility was NOT set!\n");
if((offdiff = cli_readint32(tbuff+1) - EC32(optional_hdr32.ImageBase)) <= exe_sections[i + 1].rva || offdiff >= exe_sections[i + 1].rva + exe_sections[i + 1].raw - 4) {
cli_dbgmsg("MEW: ESI is not in proper section\n");
break;
}
offdiff -= exe_sections[i + 1].rva;
if(!exe_sections[i + 1].rsz) {
cli_dbgmsg("MEW: mew section is empty\n");
break;
}
ssize = exe_sections[i + 1].vsz;
dsize = exe_sections[i].vsz;
cli_dbgmsg("MEW: ssize %08x dsize %08x offdiff: %08x\n", ssize, dsize, offdiff);
CLI_UNPSIZELIMITS("MEW", MAX(ssize, dsize));
CLI_UNPSIZELIMITS("MEW", MAX(ssize + dsize, exe_sections[i + 1].rsz));
if (exe_sections[i + 1].rsz < offdiff + 12 || exe_sections[i + 1].rsz > ssize) {
cli_dbgmsg("MEW: Size mismatch: %08x\n", exe_sections[i + 1].rsz);
break;
}
/* allocate needed buffer */
if (!(src = cli_calloc (ssize + dsize, sizeof(char)))) {
free(exe_sections);
return CL_EMEM;
}
if((bytes = fmap_readn(map, src + dsize, exe_sections[i + 1].raw, exe_sections[i + 1].rsz)) != exe_sections[i + 1].rsz) {
cli_dbgmsg("MEW: Can't read %d bytes [read: %lu]\n", exe_sections[i + 1].rsz, (unsigned long)bytes);
free(exe_sections);
free(src);
return CL_EREAD;
}
cli_dbgmsg("MEW: %u (%08x) bytes read\n", (unsigned int)bytes, (unsigned int)bytes);
/* count offset to lzma proc, if lzma used, 0xe8 -> call */
if (tbuff[0x7b] == '\xe8') {
if (!CLI_ISCONTAINED(exe_sections[1].rva, exe_sections[1].vsz, cli_readint32(tbuff + 0x7c) + fileoffset + 0x80, 4)) {
cli_dbgmsg("MEW: lzma proc out of bounds!\n");
free(src);
break; /* to next unpacker in chain */
}
uselzma = cli_readint32(tbuff + 0x7c) - (exe_sections[0].rva - fileoffset - 0x80);
} else {
uselzma = 0;
}
CLI_UNPTEMP("MEW",(src,exe_sections,0));
CLI_UNPRESULTS("MEW",(unmew11(src, offdiff, ssize, dsize, EC32(optional_hdr32.ImageBase), exe_sections[0].rva, uselzma, ndesc)),1,(src,0));
break;
}
}
if(epsize<168) {
free(exe_sections);
return CL_CLEAN;
}
if (found || upack) {
/* Check EP for UPX vs. FSG vs. Upack */
/* Upack 0.39 produces 2 types of executables
* 3 sections: | 2 sections (one empty, I don't chech found if !upack, since it's in OR above):
* mov esi, value | pusha
* lodsd | call $+0x9
* push eax |
*
* Upack 1.1/1.2 Beta produces [based on 2 samples (sUx) provided by aCaB]:
* 2 sections
* mov esi, value
* loads
* mov edi, eax
*
* Upack unknown [sample 0297729]
* 3 sections
* mov esi, value
* push [esi]
* jmp
*
*/
/* upack 0.39-3s + sample 0151477*/
while(((upack && nsections == 3) && /* 3 sections */
((
epbuff[0] == '\xbe' && cli_readint32(epbuff + 1) - EC32(optional_hdr32.ImageBase) > min && /* mov esi */
epbuff[5] == '\xad' && epbuff[6] == '\x50' /* lodsd; push eax */
)
||
/* based on 0297729 sample from aCaB */
(epbuff[0] == '\xbe' && cli_readint32(epbuff + 1) - EC32(optional_hdr32.ImageBase) > min && /* mov esi */
epbuff[5] == '\xff' && epbuff[6] == '\x36' /* push [esi] */
)
))
||
((!upack && nsections == 2) && /* 2 sections */
(( /* upack 0.39-2s */
epbuff[0] == '\x60' && epbuff[1] == '\xe8' && cli_readint32(epbuff+2) == 0x9 /* pusha; call+9 */
)
||
( /* upack 1.1/1.2, based on 2 samples */
epbuff[0] == '\xbe' && cli_readint32(epbuff+1) - EC32(optional_hdr32.ImageBase) < min && /* mov esi */
cli_readint32(epbuff + 1) - EC32(optional_hdr32.ImageBase) > 0 &&
epbuff[5] == '\xad' && epbuff[6] == '\x8b' && epbuff[7] == '\xf8' /* loads; mov edi, eax */
)
))
) {
uint32_t vma, off;
int a,b,c;
cli_dbgmsg("Upack characteristics found.\n");
a = exe_sections[0].vsz;
b = exe_sections[1].vsz;
if (upack) {
cli_dbgmsg("Upack: var set\n");
c = exe_sections[2].vsz;
ssize = exe_sections[0].ursz + exe_sections[0].uraw;
off = exe_sections[0].rva;
vma = EC32(optional_hdr32.ImageBase) + exe_sections[0].rva;
} else {
cli_dbgmsg("Upack: var NOT set\n");
c = exe_sections[1].rva;
ssize = exe_sections[1].uraw;
off = 0;
vma = exe_sections[1].rva - exe_sections[1].uraw;
}
dsize = a+b+c;
CLI_UNPSIZELIMITS("Upack", MAX(MAX(dsize, ssize), exe_sections[1].ursz));
if (!CLI_ISCONTAINED(0, dsize, exe_sections[1].rva - off, exe_sections[1].ursz) || (upack && !CLI_ISCONTAINED(0, dsize, exe_sections[2].rva - exe_sections[0].rva, ssize)) || ssize > dsize) {
cli_dbgmsg("Upack: probably malformed pe-header, skipping to next unpacker\n");
break;
}
if((dest = (char *) cli_calloc(dsize, sizeof(char))) == NULL) {
free(exe_sections);
return CL_EMEM;
}
if(fmap_readn(map, dest, 0, ssize) != ssize) {
cli_dbgmsg("Upack: Can't read raw data of section 0\n");
free(dest);
break;
}
if(upack) memmove(dest + exe_sections[2].rva - exe_sections[0].rva, dest, ssize);
if(fmap_readn(map, dest + exe_sections[1].rva - off, exe_sections[1].uraw, exe_sections[1].ursz) != exe_sections[1].ursz) {
cli_dbgmsg("Upack: Can't read raw data of section 1\n");
free(dest);
break;
}
CLI_UNPTEMP("Upack",(dest,exe_sections,0));
CLI_UNPRESULTS("Upack",(unupack(upack, dest, dsize, epbuff, vma, ep, EC32(optional_hdr32.ImageBase), exe_sections[0].rva, ndesc)),1,(dest,0));
break;
}
}
while(found && (DCONF & PE_CONF_FSG) && epbuff[0] == '\x87' && epbuff[1] == '\x25') {
/* FSG v2.0 support - thanks to aCaB ! */
uint32_t newesi, newedi, newebx, newedx;
ssize = exe_sections[i + 1].rsz;
dsize = exe_sections[i].vsz;
CLI_UNPSIZELIMITS("FSG", MAX(dsize, ssize));
if(ssize <= 0x19 || dsize <= ssize) {
cli_dbgmsg("FSG: Size mismatch (ssize: %d, dsize: %d)\n", ssize, dsize);
free(exe_sections);
return CL_CLEAN;
}
newedx = cli_readint32(epbuff + 2) - EC32(optional_hdr32.ImageBase);
if(!CLI_ISCONTAINED(exe_sections[i + 1].rva, exe_sections[i + 1].rsz, newedx, 4)) {
cli_dbgmsg("FSG: xchg out of bounds (%x), giving up\n", newedx);
break;
}
if(!exe_sections[i + 1].rsz || !(src = fmap_need_off_once(map, exe_sections[i + 1].raw, ssize))) {
cli_dbgmsg("Can't read raw data of section %d\n", i + 1);
free(exe_sections);
return CL_ESEEK;
}
dest = src + newedx - exe_sections[i + 1].rva;
if(newedx < exe_sections[i + 1].rva || !CLI_ISCONTAINED(src, ssize, dest, 4)) {
cli_dbgmsg("FSG: New ESP out of bounds\n");
break;
}
newedx = cli_readint32(dest) - EC32(optional_hdr32.ImageBase);
if(!CLI_ISCONTAINED(exe_sections[i + 1].rva, exe_sections[i + 1].rsz, newedx, 4)) {
cli_dbgmsg("FSG: New ESP (%x) is wrong\n", newedx);
break;
}
dest = src + newedx - exe_sections[i + 1].rva;
if(!CLI_ISCONTAINED(src, ssize, dest, 32)) {
cli_dbgmsg("FSG: New stack out of bounds\n");
break;
}
newedi = cli_readint32(dest) - EC32(optional_hdr32.ImageBase);
newesi = cli_readint32(dest + 4) - EC32(optional_hdr32.ImageBase);
newebx = cli_readint32(dest + 16) - EC32(optional_hdr32.ImageBase);
newedx = cli_readint32(dest + 20);
if(newedi != exe_sections[i].rva) {
cli_dbgmsg("FSG: Bad destination buffer (edi is %x should be %x)\n", newedi, exe_sections[i].rva);
break;
}
if(newesi < exe_sections[i + 1].rva || newesi - exe_sections[i + 1].rva >= exe_sections[i + 1].rsz) {
cli_dbgmsg("FSG: Source buffer out of section bounds\n");
break;
}
if(!CLI_ISCONTAINED(exe_sections[i + 1].rva, exe_sections[i + 1].rsz, newebx, 16)) {
cli_dbgmsg("FSG: Array of functions out of bounds\n");
break;
}
newedx=cli_readint32(newebx + 12 - exe_sections[i + 1].rva + src) - EC32(optional_hdr32.ImageBase);
cli_dbgmsg("FSG: found old EP @%x\n",newedx);
if((dest = (char *) cli_calloc(dsize, sizeof(char))) == NULL) {
free(exe_sections);
free(src);
return CL_EMEM;
}
CLI_UNPTEMP("FSG",(dest,exe_sections,0));
CLI_UNPRESULTSFSG2("FSG",(unfsg_200(newesi - exe_sections[i + 1].rva + src, dest, ssize + exe_sections[i + 1].rva - newesi, dsize, newedi, EC32(optional_hdr32.ImageBase), newedx, ndesc)),1,(dest,0));
break;
}
while(found && (DCONF & PE_CONF_FSG) && epbuff[0] == '\xbe' && cli_readint32(epbuff + 1) - EC32(optional_hdr32.ImageBase) < min) {
/* FSG support - v. 1.33 (thx trog for the many samples) */
int sectcnt = 0;
char *support;
uint32_t newesi, newedi, oldep, gp, t;
struct cli_exe_section *sections;
ssize = exe_sections[i + 1].rsz;
dsize = exe_sections[i].vsz;
CLI_UNPSIZELIMITS("FSG", MAX(dsize, ssize));
if(ssize <= 0x19 || dsize <= ssize) {
cli_dbgmsg("FSG: Size mismatch (ssize: %d, dsize: %d)\n", ssize, dsize);
free(exe_sections);
return CL_CLEAN;
}
if(!(t = cli_rawaddr(cli_readint32(epbuff + 1) - EC32(optional_hdr32.ImageBase), NULL, 0 , &err, fsize, hdr_size)) && err ) {
cli_dbgmsg("FSG: Support data out of padding area\n");
break;
}
gp = exe_sections[i + 1].raw - t;
CLI_UNPSIZELIMITS("FSG", gp);
if(!(support = fmap_need_off_once(map, t, gp))) {
cli_dbgmsg("Can't read %d bytes from padding area\n", gp);
free(exe_sections);
return CL_EREAD;
}
/* newebx = cli_readint32(support) - EC32(optional_hdr32.ImageBase); Unused */
newedi = cli_readint32(support + 4) - EC32(optional_hdr32.ImageBase); /* 1st dest */
newesi = cli_readint32(support + 8) - EC32(optional_hdr32.ImageBase); /* Source */
if(newesi < exe_sections[i + 1].rva || newesi - exe_sections[i + 1].rva >= exe_sections[i + 1].rsz) {
cli_dbgmsg("FSG: Source buffer out of section bounds\n");
break;
}
if(newedi != exe_sections[i].rva) {
cli_dbgmsg("FSG: Bad destination (is %x should be %x)\n", newedi, exe_sections[i].rva);
break;
}
/* Counting original sections */
for(t = 12; t < gp - 4; t += 4) {
uint32_t rva = cli_readint32(support+t);
if(!rva)
break;
rva -= EC32(optional_hdr32.ImageBase)+1;
sectcnt++;
if(rva % 0x1000) cli_dbgmsg("FSG: Original section %d is misaligned\n", sectcnt);
if(rva < exe_sections[i].rva || rva - exe_sections[i].rva >= exe_sections[i].vsz) {
cli_dbgmsg("FSG: Original section %d is out of bounds\n", sectcnt);
break;
}
}
if(t >= gp - 4 || cli_readint32(support + t)) {
break;
}
if((sections = (struct cli_exe_section *) cli_malloc((sectcnt + 1) * sizeof(struct cli_exe_section))) == NULL) {
free(exe_sections);
return CL_EMEM;
}
sections[0].rva = newedi;
for(t = 1; t <= (uint32_t)sectcnt; t++)
sections[t].rva = cli_readint32(support + 8 + t * 4) - 1 - EC32(optional_hdr32.ImageBase);
if(!exe_sections[i + 1].rsz || !(src = fmap_need_off_once(map, exe_sections[i + 1].raw, ssize))) {
cli_dbgmsg("Can't read raw data of section %d\n", i);
free(exe_sections);
free(sections);
return CL_EREAD;
}
if((dest = (char *) cli_calloc(dsize, sizeof(char))) == NULL) {
free(exe_sections);
free(sections);
return CL_EMEM;
}
oldep = vep + 161 + 6 + cli_readint32(epbuff+163);
cli_dbgmsg("FSG: found old EP @%x\n", oldep);
CLI_UNPTEMP("FSG",(dest,sections,exe_sections,0));
CLI_UNPRESULTSFSG1("FSG",(unfsg_133(src + newesi - exe_sections[i + 1].rva, dest, ssize + exe_sections[i + 1].rva - newesi, dsize, sections, sectcnt, EC32(optional_hdr32.ImageBase), oldep, ndesc)),1,(dest,sections,0));
break; /* were done with 1.33 */
}
while(found && (DCONF & PE_CONF_FSG) && epbuff[0] == '\xbb' && cli_readint32(epbuff + 1) - EC32(optional_hdr32.ImageBase) < min && epbuff[5] == '\xbf' && epbuff[10] == '\xbe' && vep >= exe_sections[i + 1].rva && vep - exe_sections[i + 1].rva > exe_sections[i + 1].rva - 0xe0 ) {
/* FSG support - v. 1.31 */
int sectcnt = 0;
uint32_t gp, t = cli_rawaddr(cli_readint32(epbuff+1) - EC32(optional_hdr32.ImageBase), NULL, 0 , &err, fsize, hdr_size);
char *support;
uint32_t newesi = cli_readint32(epbuff+11) - EC32(optional_hdr32.ImageBase);
uint32_t newedi = cli_readint32(epbuff+6) - EC32(optional_hdr32.ImageBase);
uint32_t oldep = vep - exe_sections[i + 1].rva;
struct cli_exe_section *sections;
ssize = exe_sections[i + 1].rsz;
dsize = exe_sections[i].vsz;
if(err) {
cli_dbgmsg("FSG: Support data out of padding area\n");
break;
}
if(newesi < exe_sections[i + 1].rva || newesi - exe_sections[i + 1].rva >= exe_sections[i + 1].raw) {
cli_dbgmsg("FSG: Source buffer out of section bounds\n");
break;
}
if(newedi != exe_sections[i].rva) {
cli_dbgmsg("FSG: Bad destination (is %x should be %x)\n", newedi, exe_sections[i].rva);
break;
}
CLI_UNPSIZELIMITS("FSG", MAX(dsize, ssize));
if(ssize <= 0x19 || dsize <= ssize) {
cli_dbgmsg("FSG: Size mismatch (ssize: %d, dsize: %d)\n", ssize, dsize);
free(exe_sections);
return CL_CLEAN;
}
gp = exe_sections[i + 1].raw - t;
CLI_UNPSIZELIMITS("FSG", gp)
if(!(support = fmap_need_off_once(map, t, gp))) {
cli_dbgmsg("Can't read %d bytes from padding area\n", gp);
free(exe_sections);
return CL_EREAD;
}
/* Counting original sections */
for(t = 0; t < gp - 2; t += 2) {
uint32_t rva = support[t]|(support[t+1]<<8);
if (rva == 2 || rva == 1)
break;
rva = ((rva-2)<<12) - EC32(optional_hdr32.ImageBase);
sectcnt++;
if(rva < exe_sections[i].rva || rva - exe_sections[i].rva >= exe_sections[i].vsz) {
cli_dbgmsg("FSG: Original section %d is out of bounds\n", sectcnt);
break;
}
}
if(t >= gp-10 || cli_readint32(support + t + 6) != 2) {
break;
}
if((sections = (struct cli_exe_section *) cli_malloc((sectcnt + 1) * sizeof(struct cli_exe_section))) == NULL) {
free(exe_sections);
return CL_EMEM;
}
sections[0].rva = newedi;
for(t = 0; t <= (uint32_t)sectcnt - 1; t++) {
sections[t+1].rva = (((support[t*2]|(support[t*2+1]<<8))-2)<<12)-EC32(optional_hdr32.ImageBase);
}
if(!exe_sections[i + 1].rsz || !(src = fmap_need_off_once(map, exe_sections[i + 1].raw, ssize))) {
cli_dbgmsg("FSG: Can't read raw data of section %d\n", i);
free(exe_sections);
free(sections);
return CL_EREAD;
}
if((dest = (char *) cli_calloc(dsize, sizeof(char))) == NULL) {
free(exe_sections);
free(sections);
return CL_EMEM;
}
gp = 0xda + 6*(epbuff[16]=='\xe8');
oldep = vep + gp + 6 + cli_readint32(src+gp+2+oldep);
cli_dbgmsg("FSG: found old EP @%x\n", oldep);
CLI_UNPTEMP("FSG",(dest,sections,exe_sections,0));
CLI_UNPRESULTSFSG1("FSG",(unfsg_133(src + newesi - exe_sections[i + 1].rva, dest, ssize + exe_sections[i + 1].rva - newesi, dsize, sections, sectcnt, EC32(optional_hdr32.ImageBase), oldep, ndesc)),1,(dest,sections,0));
break; /* were done with 1.31 */
}
if(found && (DCONF & PE_CONF_UPX)) {
/* UPX support */
/* we assume (i + 1) is UPX1 */
ssize = exe_sections[i + 1].rsz;
dsize = exe_sections[i].vsz + exe_sections[i + 1].vsz;
CLI_UNPSIZELIMITS("UPX", MAX(dsize, ssize));
if(ssize <= 0x19 || dsize <= ssize || dsize > CLI_MAX_ALLOCATION ) {
cli_dbgmsg("UPX: Size mismatch or dsize too big (ssize: %d, dsize: %d)\n", ssize, dsize);
free(exe_sections);
return CL_CLEAN;
}
if(!exe_sections[i + 1].rsz || !(src = fmap_need_off_once(map, exe_sections[i + 1].raw, ssize))) {
cli_dbgmsg("UPX: Can't read raw data of section %d\n", i+1);
free(exe_sections);
return CL_EREAD;
}
if((dest = (char *) cli_calloc(dsize + 8192, sizeof(char))) == NULL) {
free(exe_sections);
return CL_EMEM;
}
/* try to detect UPX code */
if(cli_memstr(UPX_NRV2B, 24, epbuff + 0x69, 13) || cli_memstr(UPX_NRV2B, 24, epbuff + 0x69 + 8, 13)) {
cli_dbgmsg("UPX: Looks like a NRV2B decompression routine\n");
upxfn = upx_inflate2b;
} else if(cli_memstr(UPX_NRV2D, 24, epbuff + 0x69, 13) || cli_memstr(UPX_NRV2D, 24, epbuff + 0x69 + 8, 13)) {
cli_dbgmsg("UPX: Looks like a NRV2D decompression routine\n");
upxfn = upx_inflate2d;
} else if(cli_memstr(UPX_NRV2E, 24, epbuff + 0x69, 13) || cli_memstr(UPX_NRV2E, 24, epbuff + 0x69 + 8, 13)) {
cli_dbgmsg("UPX: Looks like a NRV2E decompression routine\n");
upxfn = upx_inflate2e;
}
if(upxfn) {
int skew = cli_readint32(epbuff + 2) - EC32(optional_hdr32.ImageBase) - exe_sections[i + 1].rva;
if(epbuff[1] != '\xbe' || skew <= 0 || skew > 0xfff) { /* FIXME: legit skews?? */
skew = 0;
if(upxfn(src, ssize, dest, &dsize, exe_sections[i].rva, exe_sections[i + 1].rva, vep) >= 0)
upx_success = 1;
} else {
cli_dbgmsg("UPX: UPX1 seems skewed by %d bytes\n", skew);
if(upxfn(src + skew, ssize - skew, dest, &dsize, exe_sections[i].rva, exe_sections[i + 1].rva, vep-skew) >= 0 || upxfn(src, ssize, dest, &dsize, exe_sections[i].rva, exe_sections[i + 1].rva, vep) >= 0)
upx_success = 1;
}
if(upx_success)
cli_dbgmsg("UPX: Successfully decompressed\n");
else
cli_dbgmsg("UPX: Preferred decompressor failed\n");
}
if(!upx_success && upxfn != upx_inflate2b) {
if(upx_inflate2b(src, ssize, dest, &dsize, exe_sections[i].rva, exe_sections[i + 1].rva, vep) == -1 && upx_inflate2b(src + 0x15, ssize - 0x15, dest, &dsize, exe_sections[i].rva, exe_sections[i + 1].rva, vep - 0x15) == -1) {
cli_dbgmsg("UPX: NRV2B decompressor failed\n");
} else {
upx_success = 1;
cli_dbgmsg("UPX: Successfully decompressed with NRV2B\n");
}
}
if(!upx_success && upxfn != upx_inflate2d) {
if(upx_inflate2d(src, ssize, dest, &dsize, exe_sections[i].rva, exe_sections[i + 1].rva, vep) == -1 && upx_inflate2d(src + 0x15, ssize - 0x15, dest, &dsize, exe_sections[i].rva, exe_sections[i + 1].rva, vep - 0x15) == -1) {
cli_dbgmsg("UPX: NRV2D decompressor failed\n");
} else {
upx_success = 1;
cli_dbgmsg("UPX: Successfully decompressed with NRV2D\n");
}
}
if(!upx_success && upxfn != upx_inflate2e) {
if(upx_inflate2e(src, ssize, dest, &dsize, exe_sections[i].rva, exe_sections[i + 1].rva, vep) == -1 && upx_inflate2e(src + 0x15, ssize - 0x15, dest, &dsize, exe_sections[i].rva, exe_sections[i + 1].rva, vep - 0x15) == -1) {
cli_dbgmsg("UPX: NRV2E decompressor failed\n");
} else {
upx_success = 1;
cli_dbgmsg("UPX: Successfully decompressed with NRV2E\n");
}
}
if(cli_memstr(UPX_LZMA2, 20, epbuff + 0x2f, 20)) {
uint32_t strictdsize=cli_readint32(epbuff+0x21), skew = 0;
if(ssize > 0x15 && epbuff[0] == '\x60' && epbuff[1] == '\xbe') {
skew = cli_readint32(epbuff+2) - exe_sections[i + 1].rva - optional_hdr32.ImageBase;
if(skew!=0x15) skew = 0;
}
if(strictdsize<=dsize)
upx_success = upx_inflatelzma(src+skew, ssize-skew, dest, &strictdsize, exe_sections[i].rva, exe_sections[i + 1].rva, vep) >=0;
} else if (cli_memstr(UPX_LZMA1, 20, epbuff + 0x39, 20)) {
uint32_t strictdsize=cli_readint32(epbuff+0x2b), skew = 0;
if(ssize > 0x15 && epbuff[0] == '\x60' && epbuff[1] == '\xbe') {
skew = cli_readint32(epbuff+2) - exe_sections[i + 1].rva - optional_hdr32.ImageBase;
if(skew!=0x15) skew = 0;
}
if(strictdsize<=dsize)
upx_success = upx_inflatelzma(src+skew, ssize-skew, dest, &strictdsize, exe_sections[i].rva, exe_sections[i + 1].rva, vep) >=0;
}
if(!upx_success) {
cli_dbgmsg("UPX: All decompressors failed\n");
free(dest);
}
}
if(upx_success) {
free(exe_sections);
CLI_UNPTEMP("UPX/FSG",(dest,0));
if((unsigned int) write(ndesc, dest, dsize) != dsize) {
cli_dbgmsg("UPX/FSG: Can't write %d bytes\n", dsize);
free(tempfile);
free(dest);
close(ndesc);
return CL_EWRITE;
}
free(dest);
lseek(ndesc, 0, SEEK_SET);
if(ctx->engine->keeptmp)
cli_dbgmsg("UPX/FSG: Decompressed data saved in %s\n", tempfile);
cli_dbgmsg("***** Scanning decompressed file *****\n");
SHA_OFF;
if((ret = cli_magic_scandesc(ndesc, ctx)) == CL_VIRUS) {
close(ndesc);
CLI_TMPUNLK();
free(tempfile);
SHA_RESET;
return CL_VIRUS;
}
SHA_RESET;
close(ndesc);
CLI_TMPUNLK();
free(tempfile);
return ret;
}
/* Petite */
if(epsize<200) {
free(exe_sections);
return CL_CLEAN;
}
found = 2;
if(epbuff[0] != '\xb8' || (uint32_t) cli_readint32(epbuff + 1) != exe_sections[nsections - 1].rva + EC32(optional_hdr32.ImageBase)) {
if(nsections < 2 || epbuff[0] != '\xb8' || (uint32_t) cli_readint32(epbuff + 1) != exe_sections[nsections - 2].rva + EC32(optional_hdr32.ImageBase))
found = 0;
else
found = 1;
}
if(found && (DCONF & PE_CONF_PETITE)) {
cli_dbgmsg("Petite: v2.%d compression detected\n", found);
if(cli_readint32(epbuff + 0x80) == 0x163c988d) {
cli_dbgmsg("Petite: level zero compression is not supported yet\n");
} else {
dsize = max - min;
CLI_UNPSIZELIMITS("Petite", dsize);
if((dest = (char *) cli_calloc(dsize, sizeof(char))) == NULL) {
cli_dbgmsg("Petite: Can't allocate %d bytes\n", dsize);
free(exe_sections);
return CL_EMEM;
}
for(i = 0 ; i < nsections; i++) {
if(exe_sections[i].raw) {
if(!exe_sections[i].rsz || fmap_readn(map, dest + exe_sections[i].rva - min, exe_sections[i].raw, exe_sections[i].ursz) != exe_sections[i].ursz) {
free(exe_sections);
free(dest);
return CL_CLEAN;
}
}
}
CLI_UNPTEMP("Petite",(dest,exe_sections,0));
CLI_UNPRESULTS("Petite",(petite_inflate2x_1to9(dest, min, max - min, exe_sections, nsections - (found == 1 ? 1 : 0), EC32(optional_hdr32.ImageBase),vep, ndesc, found, EC32(optional_hdr32.DataDirectory[2].VirtualAddress),EC32(optional_hdr32.DataDirectory[2].Size))),0,(dest,0));
}
}
/* PESpin 1.1 */
if((DCONF & PE_CONF_PESPIN) && nsections > 1 &&
vep >= exe_sections[nsections - 1].rva &&
vep < exe_sections[nsections - 1].rva + exe_sections[nsections - 1].rsz - 0x3217 - 4 &&
memcmp(epbuff+4, "\xe8\x00\x00\x00\x00\x8b\x1c\x24\x83\xc3", 10) == 0) {
char *spinned;
CLI_UNPSIZELIMITS("PEspin", fsize);
if((spinned = (char *) cli_malloc(fsize)) == NULL) {
free(exe_sections);
return CL_EMEM;
}
if((size_t) fmap_readn(map, spinned, 0, fsize) != fsize) {
cli_dbgmsg("PESpin: Can't read %lu bytes\n", (unsigned long)fsize);
free(spinned);
free(exe_sections);
return CL_EREAD;
}
CLI_UNPTEMP("PESpin",(spinned,exe_sections,0));
CLI_UNPRESULTS_("PEspin",SPINCASE(),(unspin(spinned, fsize, exe_sections, nsections - 1, vep, ndesc, ctx)),0,(spinned,0));
}
/* yC 1.3 & variants */
if((DCONF & PE_CONF_YC) && nsections > 1 &&
(EC32(optional_hdr32.AddressOfEntryPoint) == exe_sections[nsections - 1].rva + 0x60)) {
uint32_t ecx = 0;
int16_t offset;
/* yC 1.3 */
if (!memcmp(epbuff, "\x55\x8B\xEC\x53\x56\x57\x60\xE8\x00\x00\x00\x00\x5D\x81\xED", 15) &&
!memcmp(epbuff+0x26, "\x8D\x3A\x8B\xF7\x33\xC0\xEB\x04\x90\xEB\x01\xC2\xAC", 13) &&
((uint8_t)epbuff[0x13] == 0xB9) &&
((uint16_t)(cli_readint16(epbuff+0x18)) == 0xE981) &&
!memcmp(epbuff+0x1e,"\x8B\xD5\x81\xC2", 4)) {
offset = 0;
if (0x6c - cli_readint32(epbuff+0xf) + cli_readint32(epbuff+0x22) == 0xC6)
ecx = cli_readint32(epbuff+0x14) - cli_readint32(epbuff+0x1a);
}
/* yC 1.3 variant */
if (!ecx && !memcmp(epbuff, "\x55\x8B\xEC\x83\xEC\x40\x53\x56\x57", 9) &&
!memcmp(epbuff+0x17, "\xe8\x00\x00\x00\x00\x5d\x81\xed", 8) &&
((uint8_t)epbuff[0x23] == 0xB9)) {
offset = 0x10;
if (0x6c - cli_readint32(epbuff+0x1f) + cli_readint32(epbuff+0x32) == 0xC6)
ecx = cli_readint32(epbuff+0x24) - cli_readint32(epbuff+0x2a);
}
/* yC 1.x/modified */
if (!ecx && !memcmp(epbuff, "\x60\xe8\x00\x00\x00\x00\x5d\x81\xed",9) &&
((uint8_t)epbuff[0xd] == 0xb9) &&
((uint16_t)cli_readint16(epbuff + 0x12)== 0xbd8d) &&
!memcmp(epbuff+0x18, "\x8b\xf7\xac", 3)) {
offset = -0x18;
if (0x66 - cli_readint32(epbuff+0x9) + cli_readint32(epbuff+0x14) == 0xae)
ecx = cli_readint32(epbuff+0xe);
}
if (ecx > 0x800 && ecx < 0x2000 &&
!memcmp(epbuff+0x63+offset, "\xaa\xe2\xcc", 3) &&
(fsize >= exe_sections[nsections-1].raw + 0xC6 + ecx + offset)) {
char *spinned;
if((spinned = (char *) cli_malloc(fsize)) == NULL) {
free(exe_sections);
return CL_EMEM;
}
if((size_t) fmap_readn(map, spinned, 0, fsize) != fsize) {
cli_dbgmsg("yC: Can't read %lu bytes\n", (unsigned long)fsize);
free(spinned);
free(exe_sections);
return CL_EREAD;
}
cli_dbgmsg("%d,%d,%d,%d\n", nsections-1, e_lfanew, ecx, offset);
CLI_UNPTEMP("yC",(spinned,exe_sections,0));
CLI_UNPRESULTS("yC",(yc_decrypt(spinned, fsize, exe_sections, nsections-1, e_lfanew, ndesc, ecx, offset)),0,(spinned,0));
}
}
/* WWPack */
while ((DCONF & PE_CONF_WWPACK) && nsections > 1 &&
vep == exe_sections[nsections - 1].rva &&
memcmp(epbuff, "\x53\x55\x8b\xe8\x33\xdb\xeb", 7) == 0 &&
memcmp(epbuff+0x68, "\xe8\x00\x00\x00\x00\x58\x2d\x6d\x00\x00\x00\x50\x60\x33\xc9\x50\x58\x50\x50", 19) == 0) {
uint32_t head = exe_sections[nsections - 1].raw;
uint8_t *packer;
ssize = 0;
for(i=0 ; ; i++) {
if(exe_sections[i].raw<head)
head=exe_sections[i].raw;
if(i+1==nsections) break;
if(ssize<exe_sections[i].rva+exe_sections[i].vsz)
ssize=exe_sections[i].rva+exe_sections[i].vsz;
}
if(!head || !ssize || head>ssize) break;
CLI_UNPSIZELIMITS("WWPack", ssize);
if(!(src=(char *)cli_calloc(ssize, sizeof(char)))) {
free(exe_sections);
return CL_EMEM;
}
if((size_t) fmap_readn(map, src, 0, head) != head) {
cli_dbgmsg("WWPack: Can't read %d bytes from headers\n", head);
free(src);
free(exe_sections);
return CL_EREAD;
}
for(i = 0 ; i < (unsigned int)nsections-1; i++) {
if(!exe_sections[i].rsz) continue;
if(!CLI_ISCONTAINED(src, ssize, src+exe_sections[i].rva, exe_sections[i].rsz)) break;
if(fmap_readn(map, src+exe_sections[i].rva, exe_sections[i].raw, exe_sections[i].rsz)!=exe_sections[i].rsz) break;
}
if(i+1!=nsections) {
cli_dbgmsg("WWpack: Probably hacked/damaged file.\n");
free(src);
break;
}
if((packer = (uint8_t *) cli_calloc(exe_sections[nsections - 1].rsz, sizeof(char))) == NULL) {
free(src);
free(exe_sections);
return CL_EMEM;
}
if(!exe_sections[nsections - 1].rsz || (size_t) fmap_readn(map, packer, exe_sections[nsections - 1].raw, exe_sections[nsections - 1].rsz) != exe_sections[nsections - 1].rsz) {
cli_dbgmsg("WWPack: Can't read %d bytes from wwpack sect\n", exe_sections[nsections - 1].rsz);
free(src);
free(packer);
free(exe_sections);
return CL_EREAD;
}
CLI_UNPTEMP("WWPack",(src,packer,exe_sections,0));
CLI_UNPRESULTS("WWPack",(wwunpack((uint8_t *)src, ssize, packer, exe_sections, nsections-1, e_lfanew, ndesc)),0,(src,packer,0));
break;
}
/* ASPACK support */
while((DCONF & PE_CONF_ASPACK) && ep+58+0x70e < fsize && !memcmp(epbuff,"\x60\xe8\x03\x00\x00\x00\xe9\xeb",8)) {
if(epsize<0x3bf || memcmp(epbuff+0x3b9, "\x68\x00\x00\x00\x00\xc3",6)) break;
ssize = 0;
for(i=0 ; i< nsections ; i++)
if(ssize<exe_sections[i].rva+exe_sections[i].vsz)
ssize=exe_sections[i].rva+exe_sections[i].vsz;
if(!ssize) break;
CLI_UNPSIZELIMITS("Aspack", ssize);
if(!(src=(char *)cli_calloc(ssize, sizeof(char)))) {
free(exe_sections);
return CL_EMEM;
}
for(i = 0 ; i < (unsigned int)nsections; i++) {
if(!exe_sections[i].rsz) continue;
if(!CLI_ISCONTAINED(src, ssize, src+exe_sections[i].rva, exe_sections[i].rsz)) break;
if(fmap_readn(map, src+exe_sections[i].rva, exe_sections[i].raw, exe_sections[i].rsz)!=exe_sections[i].rsz) break;
}
if(i!=nsections) {
cli_dbgmsg("Aspack: Probably hacked/damaged Aspack file.\n");
free(src);
break;
}
CLI_UNPTEMP("Aspack",(src,exe_sections,0));
CLI_UNPRESULTS("Aspack",(unaspack212((uint8_t *)src, ssize, exe_sections, nsections, vep-1, EC32(optional_hdr32.ImageBase), ndesc)),1,(src,0));
break;
}
/* NsPack */
while (DCONF & PE_CONF_NSPACK) {
uint32_t eprva = vep;
uint32_t start_of_stuff, rep = ep;
unsigned int nowinldr;
char *nbuff;
src=epbuff;
if (*epbuff=='\xe9') { /* bitched headers */
eprva = cli_readint32(epbuff+1)+vep+5;
if (!(rep = cli_rawaddr(eprva, exe_sections, nsections, &err, fsize, hdr_size)) && err) break;
if (!(nbuff = fmap_need_off_once(map, rep, 24))) break;
src = nbuff;
}
if (memcmp(src, "\x9c\x60\xe8\x00\x00\x00\x00\x5d\xb8\x07\x00\x00\x00", 13)) break;
nowinldr = 0x54-cli_readint32(src+17);
cli_dbgmsg("NsPack: Found *start_of_stuff @delta-%x\n", nowinldr);
if(!(nbuff = fmap_need_off_once(map, rep-nowinldr, 4))) break;
start_of_stuff=rep+cli_readint32(nbuff);
if(!(nbuff = fmap_need_off_once(map, start_of_stuff, 20))) break;
src = nbuff;
if (!cli_readint32(nbuff)) {
start_of_stuff+=4; /* FIXME: more to do */
src+=4;
}
ssize = cli_readint32(src+5)|0xff;
dsize = cli_readint32(src+9);
CLI_UNPSIZELIMITS("NsPack", MAX(ssize,dsize));
if (!ssize || !dsize || dsize != exe_sections[0].vsz) break;
if (!(dest=cli_malloc(dsize))) break;
/* memset(dest, 0xfc, dsize); */
if(!(src = fmap_need_off(map, start_of_stuff, ssize))) {
free(dest);
break;
}
/* memset(src, 0x00, ssize); */
eprva+=0x27a;
if (!(rep = cli_rawaddr(eprva, exe_sections, nsections, &err, fsize, hdr_size)) && err) {
free(dest);
break;
}
if(!(nbuff = fmap_need_off_once(map, rep, 5))) {
free(dest);
break;
}
fmap_unneed_off(map, start_of_stuff, ssize);
eprva=eprva+5+cli_readint32(nbuff+1);
cli_dbgmsg("NsPack: OEP = %08x\n", eprva);
CLI_UNPTEMP("NsPack",(dest,exe_sections,0));
CLI_UNPRESULTS("NsPack",(unspack(src, dest, ctx, exe_sections[0].rva, EC32(optional_hdr32.ImageBase), eprva, ndesc)),0,(dest,0));
break;
}
/* to be continued ... */
/* !!!!!!!!!!!!!! PACKERS END HERE !!!!!!!!!!!!!! */
ctx->corrupted_input = corrupted_cur;
/* Bytecode BC_PE_UNPACKER hook */
bc_ctx = cli_bytecode_context_alloc();
if (!bc_ctx) {
cli_errmsg("cli_scanpe: can't allocate memory for bc_ctx\n");
return CL_EMEM;
}
cli_bytecode_context_setpe(bc_ctx, &pedata, exe_sections);
cli_bytecode_context_setctx(bc_ctx, ctx);
ret = cli_bytecode_runhook(ctx, ctx->engine, bc_ctx, BC_PE_UNPACKER, map, ctx->virname);
switch (ret) {
case CL_VIRUS:
free(exe_sections);
cli_bytecode_context_destroy(bc_ctx);
return CL_VIRUS;
case CL_SUCCESS:
ndesc = cli_bytecode_context_getresult_file(bc_ctx, &tempfile);
cli_bytecode_context_destroy(bc_ctx);
if (ndesc != -1 && tempfile) {
CLI_UNPRESULTS("bytecode PE hook", 1, 1, (0));
}
break;
default:
cli_bytecode_context_destroy(bc_ctx);
}
free(exe_sections);
return CL_CLEAN;
}
int cli_peheader(fmap_t *map, struct cli_exe_info *peinfo)
{
uint16_t e_magic; /* DOS signature ("MZ") */
uint32_t e_lfanew; /* address of new exe header */
/* Obsolete - see below
uint32_t min = 0, max = 0;
*/
struct pe_image_file_hdr file_hdr;
union {
struct pe_image_optional_hdr64 opt64;
struct pe_image_optional_hdr32 opt32;
} pe_opt;
struct pe_image_section_hdr *section_hdr;
int i;
unsigned int err, pe_plus = 0;
uint32_t valign, falign, hdr_size;
size_t fsize;
ssize_t at;
struct pe_image_data_dir *dirs;
cli_dbgmsg("in cli_peheader\n");
fsize = map->len - peinfo->offset;
if(fmap_readn(map, &e_magic, peinfo->offset, sizeof(e_magic)) != sizeof(e_magic)) {
cli_dbgmsg("Can't read DOS signature\n");
return CL_CLEAN;
}
if(EC16(e_magic) != PE_IMAGE_DOS_SIGNATURE && EC16(e_magic) != PE_IMAGE_DOS_SIGNATURE_OLD) {
cli_dbgmsg("Invalid DOS signature\n");
return -1;
}
if(fmap_readn(map, &e_lfanew, peinfo->offset + 58 + sizeof(e_magic), sizeof(e_lfanew)) != sizeof(e_lfanew)) {
/* truncated header? */
return -1;
}
e_lfanew = EC32(e_lfanew);
if(!e_lfanew) {
cli_dbgmsg("Not a PE file\n");
return -1;
}
if(fmap_readn(map, &file_hdr, peinfo->offset + e_lfanew, sizeof(struct pe_image_file_hdr)) != sizeof(struct pe_image_file_hdr)) {
/* bad information in e_lfanew - probably not a PE file */
cli_dbgmsg("Can't read file header\n");
return -1;
}
if(EC32(file_hdr.Magic) != PE_IMAGE_NT_SIGNATURE) {
cli_dbgmsg("Invalid PE signature (probably NE file)\n");
return -1;
}
if ( (peinfo->nsections = EC16(file_hdr.NumberOfSections)) < 1 || peinfo->nsections > 96 ) return -1;
if (EC16(file_hdr.SizeOfOptionalHeader) < sizeof(struct pe_image_optional_hdr32)) {
cli_dbgmsg("SizeOfOptionalHeader too small\n");
return -1;
}
at = peinfo->offset + e_lfanew + sizeof(struct pe_image_file_hdr);
if(fmap_readn(map, &optional_hdr32, at, sizeof(struct pe_image_optional_hdr32)) != sizeof(struct pe_image_optional_hdr32)) {
cli_dbgmsg("Can't read optional file header\n");
return -1;
}
at += sizeof(struct pe_image_optional_hdr32);
if(EC16(optional_hdr64.Magic)==PE32P_SIGNATURE) { /* PE+ */
if(EC16(file_hdr.SizeOfOptionalHeader)!=sizeof(struct pe_image_optional_hdr64)) {
cli_dbgmsg("Incorrect SizeOfOptionalHeader for PE32+\n");
return -1;
}
if(fmap_readn(map, &optional_hdr32 + 1, at, sizeof(struct pe_image_optional_hdr64) - sizeof(struct pe_image_optional_hdr32)) != sizeof(struct pe_image_optional_hdr64) - sizeof(struct pe_image_optional_hdr32)) {
cli_dbgmsg("Can't read optional file header\n");
return -1;
}
at += sizeof(struct pe_image_optional_hdr64) - sizeof(struct pe_image_optional_hdr32);
hdr_size = EC32(optional_hdr64.SizeOfHeaders);
pe_plus=1;
} else { /* PE */
if (EC16(file_hdr.SizeOfOptionalHeader)!=sizeof(struct pe_image_optional_hdr32)) {
/* Seek to the end of the long header */
at += EC16(file_hdr.SizeOfOptionalHeader)-sizeof(struct pe_image_optional_hdr32);
}
hdr_size = EC32(optional_hdr32.SizeOfHeaders);
}
valign = (pe_plus)?EC32(optional_hdr64.SectionAlignment):EC32(optional_hdr32.SectionAlignment);
falign = (pe_plus)?EC32(optional_hdr64.FileAlignment):EC32(optional_hdr32.FileAlignment);
peinfo->hdr_size = hdr_size = PESALIGN(hdr_size, valign);
peinfo->section = (struct cli_exe_section *) cli_calloc(peinfo->nsections, sizeof(struct cli_exe_section));
if(!peinfo->section) {
cli_dbgmsg("Can't allocate memory for section headers\n");
return -1;
}
section_hdr = (struct pe_image_section_hdr *) cli_calloc(peinfo->nsections, sizeof(struct pe_image_section_hdr));
if(!section_hdr) {
cli_dbgmsg("Can't allocate memory for section headers\n");
free(peinfo->section);
peinfo->section = NULL;
return -1;
}
if(fmap_readn(map, section_hdr, at, peinfo->nsections * sizeof(struct pe_image_section_hdr)) != peinfo->nsections * sizeof(struct pe_image_section_hdr)) {
cli_dbgmsg("Can't read section header\n");
cli_dbgmsg("Possibly broken PE file\n");
free(section_hdr);
free(peinfo->section);
peinfo->section = NULL;
return -1;
}
at += sizeof(struct pe_image_section_hdr)*peinfo->nsections;
for(i = 0; falign!=0x200 && i<peinfo->nsections; i++) {
/* file alignment fallback mode - blah */
if (falign && section_hdr[i].SizeOfRawData && EC32(section_hdr[i].PointerToRawData)%falign && !(EC32(section_hdr[i].PointerToRawData)%0x200)) {
falign = 0x200;
}
}
for(i = 0; i < peinfo->nsections; i++) {
peinfo->section[i].rva = PEALIGN(EC32(section_hdr[i].VirtualAddress), valign);
peinfo->section[i].vsz = PESALIGN(EC32(section_hdr[i].VirtualSize), valign);
peinfo->section[i].raw = PEALIGN(EC32(section_hdr[i].PointerToRawData), falign);
peinfo->section[i].rsz = PESALIGN(EC32(section_hdr[i].SizeOfRawData), falign);
if (!peinfo->section[i].vsz && peinfo->section[i].rsz)
peinfo->section[i].vsz=PESALIGN(EC32(section_hdr[i].SizeOfRawData), valign);
if (peinfo->section[i].rsz && !CLI_ISCONTAINED(0, (uint32_t) fsize, peinfo->section[i].raw, peinfo->section[i].rsz))
peinfo->section[i].rsz = (fsize - peinfo->section[i].raw)*(fsize>peinfo->section[i].raw);
}
if(pe_plus) {
peinfo->ep = EC32(optional_hdr64.AddressOfEntryPoint);
dirs = optional_hdr64.DataDirectory;
} else {
peinfo->ep = EC32(optional_hdr32.AddressOfEntryPoint);
dirs = optional_hdr32.DataDirectory;
}
if(!(peinfo->ep = cli_rawaddr(peinfo->ep, peinfo->section, peinfo->nsections, &err, fsize, hdr_size)) && err) {
cli_dbgmsg("Broken PE file\n");
free(section_hdr);
free(peinfo->section);
peinfo->section = NULL;
return -1;
}
if(EC16(file_hdr.Characteristics) & 0x2000 || !dirs[2].Size)
peinfo->res_addr = 0;
else
peinfo->res_addr = EC32(dirs[2].VirtualAddress);
while(dirs[2].Size) {
struct vinfo_list vlist;
uint8_t *vptr, *baseptr;
uint32_t rva, res_sz;
memset(&vlist, 0, sizeof(vlist));
findres(0x10, 0xffffffff, EC32(dirs[2].VirtualAddress), map, peinfo->section, peinfo->nsections, hdr_size, versioninfo_cb, &vlist);
if(!vlist.count) break; /* No version_information */
if(cli_hashset_init(&peinfo->vinfo, 32, 80)) {
cli_errmsg("cli_peheader: Unable to init vinfo hashset\n");
free(section_hdr);
free(peinfo->section);
peinfo->section = NULL;
return -1;
}
err = 0;
for(i=0; i<vlist.count; i++) { /* enum all version_information res - RESUMABLE */
cli_dbgmsg("cli_peheader: parsing version info @ rva %x (%u/%u)\n", vlist.rvas[i], i+1, vlist.count);
rva = cli_rawaddr(vlist.rvas[i], peinfo->section, peinfo->nsections, &err, fsize, hdr_size);
if(err)
continue;
if(!(vptr = fmap_need_off_once(map, rva, 16)))
continue;
baseptr = vptr - rva;
/* parse resource */
rva = cli_readint32(vptr); /* ptr to version_info */
res_sz = cli_readint32(vptr+4); /* sizeof(resource) */
rva = cli_rawaddr(rva, peinfo->section, peinfo->nsections, &err, fsize, hdr_size);
if(err)
continue;
if(!(vptr = fmap_need_off_once(map, rva, res_sz)))
continue;
while(res_sz>4) { /* look for version_info - NOT RESUMABLE (expecting exactly one versioninfo) */
uint32_t vinfo_sz, vinfo_val_sz;
vinfo_sz = vinfo_val_sz = cli_readint32(vptr);
vinfo_sz &= 0xffff;
if(vinfo_sz > res_sz)
break; /* the content is larger than the container */
vinfo_val_sz >>= 16;
if(vinfo_sz <= 6 + 0x20 + 2 + 0x34 ||
vinfo_val_sz != 0x34 ||
memcmp(vptr+6, "V\0S\0_\0V\0E\0R\0S\0I\0O\0N\0_\0I\0N\0F\0O\0\0\0", 0x20) ||
cli_readint32(vptr + 0x28) != 0xfeef04bd) {
/* - there should be enough room for the header(6), the key "VS_VERSION_INFO"(20), the padding(2) and the value(34)
* - the value should be sizeof(fixedfileinfo)
* - the key should match
* - there should be some proper magic for fixedfileinfo */
break; /* there's no point in looking further */
}
/* move to the end of fixedfileinfo where the child elements are located */
vptr += 6 + 0x20 + 2 + 0x34;
vinfo_sz -= 6 + 0x20 + 2 + 0x34;
while(vinfo_sz > 6) { /* look for stringfileinfo - NOT RESUMABLE (expecting at most one stringfileinfo) */
uint32_t sfi_sz = cli_readint32(vptr) & 0xffff;
if(sfi_sz > vinfo_sz)
break; /* the content is larger than the container */
/* expecting stringfileinfo to always precede varfileinfo */
if(sfi_sz <= 6 + 0x1e || memcmp(vptr+6, "S\0t\0r\0i\0n\0g\0F\0i\0l\0e\0I\0n\0f\0o\0\0\0", 0x1e)) {
/* - there should be enough room for the header(6) and the key "StringFileInfo"(1e)
* - the key should match */
break; /* this is an implicit hard fail: parent is not resumable */
}
/* move to the end of stringfileinfo where the child elements are located */
vptr += 6 + 0x1e;
sfi_sz -= 6 + 0x1e;
while(sfi_sz > 6) { /* enum all stringtables - RESUMABLE */
uint32_t st_sz = cli_readint32(vptr) & 0xffff;
uint8_t *next_vptr = vptr + st_sz;
uint32_t next_sfi_sz = sfi_sz - st_sz;
if(st_sz > sfi_sz || st_sz <= 24) {
/* - the content is larger than the container
- there's no room for a stringtables (headers(6) + key(16) + padding(2)) */
break; /* this is an implicit hard fail: parent is not resumable */
}
/* move to the end of stringtable where the child elements are located */
vptr += 24;
st_sz -= 24;
while(st_sz > 6) { /* enum all strings - RESUMABLE */
uint32_t s_sz, s_key_sz, s_val_sz;
s_sz = (cli_readint32(vptr) & 0xffff) + 3;
s_sz &= ~3;
if(s_sz > st_sz || s_sz <= 6 + 2 + 8) {
/* - the content is larger than the container
* - there's no room for a minimal string
* - there's no room for the value */
st_sz = 0;
sfi_sz = 0;
break; /* force a hard fail */
}
/* ~wcstrlen(key) */
for(s_key_sz = 6; s_key_sz+1 < s_sz; s_key_sz += 2) {
if(vptr[s_key_sz] || vptr[s_key_sz+1]) continue;
s_key_sz += 2;
break;
}
s_key_sz += 3;
s_key_sz &= ~3;
if(s_key_sz >= s_sz) {
/* key overflow */
vptr += s_sz;
st_sz -= s_sz;
continue;
}
s_val_sz = s_sz - s_key_sz;
s_key_sz -= 6;
if(s_val_sz <= 2) {
/* skip unset value */
vptr += s_sz;
st_sz -= s_sz;
continue;
}
if(cli_hashset_addkey(&peinfo->vinfo, (uint32_t)(vptr - baseptr + 6))) {
cli_errmsg("cli_peheader: Unable to add rva to vinfo hashset\n");
cli_hashset_destroy(&peinfo->vinfo);
free(section_hdr);
free(peinfo->section);
peinfo->section = NULL;
return -1;
}
if(cli_debug_flag) {
char *k, *v, *s;
/* FIXME: skip too long strings */
k = cli_utf16toascii((const char*)vptr + 6, s_key_sz);
if(k) {
v = cli_utf16toascii((const char*)vptr + s_key_sz + 6, s_val_sz);
if(v) {
s = cli_str2hex((const char*)vptr + 6, s_key_sz + s_val_sz - 6);
if(s) {
cli_dbgmsg("VersionInfo (%x): '%s'='%s' - VI:%s\n", (uint32_t)(vptr - baseptr + 6), k, v, s);
free(s);
}
free(v);
}
free(k);
}
}
vptr += s_sz;
st_sz -= s_sz;
} /* enum all strings - RESUMABLE */
vptr = next_vptr;
sfi_sz = next_sfi_sz * (sfi_sz != 0);
} /* enum all stringtables - RESUMABLE */
break;
} /* look for stringfileinfo - NOT RESUMABLE */
break;
} /* look for version_info - NOT RESUMABLE */
} /* enum all version_information res - RESUMABLE */
break;
} /* while(dirs[2].Size) */
free(section_hdr);
return 0;
}