517 lines
19 KiB
C
517 lines
19 KiB
C
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/*
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* Copyright (C) 2013-2022 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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* Copyright (C) 2007-2013 Sourcefire, Inc.
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*
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* Authors: Alberto Wu
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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/*
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** petitep.c
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**
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** 09/07/2k4 - Dumped and reversed
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** 10/07/2k4 - Very 1st approach
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** 10/07/2k4 - PE stuff and main loop
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** 11/07/2k4 - Porting finished, tracking my bugs...
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** 12/07/2k4 - ARRRRRGHHH :D
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** 14/07/2k4 - Code cleaned
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** 15/07/2k4 - Securing && ClamAV porting
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** 21/07/2k4 - Unmangled imports now supported
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** 22/07/2k4 - Unstripped .relocs now supported
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**
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*/
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/*
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** Unpacks a buffer containing a petite 2.2 compressed
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** file. Doesn't perform Import Table unmangling. Doesn't
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** fixup call/jumps. Tries to "guess" the original sections
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** structure and entrypoint.
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**
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** Lotta phanx to Micky for patiently bearing my screams :P
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** Greets to Ian Luck: the SEH MOVSB thingy almost got me :O
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** TODO: Cope with level 0 and older petite versions.
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*/
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#if HAVE_CONFIG_H
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#include "clamav-config.h"
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include "clamav.h"
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#include "rebuildpe.h"
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#include "execs.h"
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#include "others.h"
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#include "petite.h"
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static int doubledl(char **scur, uint8_t *mydlptr, char *buffer, uint32_t buffersize)
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{
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unsigned char mydl = *mydlptr;
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unsigned char olddl = mydl;
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mydl *= 2;
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if (!(olddl & 0x7f)) {
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if (*scur < buffer || *scur >= buffer + buffersize - 1)
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return -1;
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olddl = **scur;
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mydl = olddl * 2 + 1;
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*scur = *scur + 1;
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}
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*mydlptr = mydl;
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return (olddl >> 7) & 1;
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}
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int petite_inflate2x_1to9(char *buf, uint32_t minrva, uint32_t bufsz, struct cli_exe_section *sections, unsigned int sectcount, uint32_t Imagebase, uint32_t pep, int desc, int version, uint32_t ResRva, uint32_t ResSize)
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{
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char *adjbuf = buf - minrva;
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char *packed = NULL;
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uint32_t thisrva = 0, bottom = 0, enc_ep = 0, irva = 0, workdone = 0, grown = 0x355, skew = 0x35;
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int j = 0, oob, mangled = 0, check4resources = 0;
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struct cli_exe_section *usects = NULL;
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void *tmpsct = NULL;
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/*
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-] The real thing [-
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*/
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/* NOTE: (435063->4350a5) Petite kernel32!imports and error strings */
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/* Here we adjust the start of packed blob, the size of petite code,
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* the difference in size if relocs were stripped
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* See below...
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*/
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if (version == 2)
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packed = adjbuf + sections[sectcount - 1].rva + 0x1b8;
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if (version == 1) {
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packed = adjbuf + sections[sectcount - 1].rva + 0x178;
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grown = 0x323; /* My name is Harry potter */
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skew = 0x34;
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}
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while (1) {
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char *ssrc, *ddst;
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uint32_t size, srva;
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int backbytes, oldback, addsize;
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unsigned int backsize;
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if (!CLI_ISCONTAINED(buf, bufsz, packed, 4)) {
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if (usects)
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free(usects);
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return 1;
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}
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srva = cli_readint32(packed);
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if (!srva) {
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/* WERE DONE !!! :D */
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int t, upd = 1;
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if (j <= 0) /* Some non petite compressed files will get here */
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return 1;
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/* Select * from sections order by rva asc; */
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while (upd) {
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upd = 0;
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for (t = 0; t < j - 1; t++) {
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uint32_t trva, trsz, tvsz;
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if (usects[t].rva <= usects[t + 1].rva)
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continue;
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trva = usects[t].rva;
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trsz = usects[t].rsz;
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tvsz = usects[t].vsz;
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usects[t].rva = usects[t + 1].rva;
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usects[t].rsz = usects[t + 1].rsz;
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usects[t].vsz = usects[t + 1].vsz;
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usects[t + 1].rva = trva;
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usects[t + 1].rsz = trsz;
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usects[t + 1].vsz = tvsz;
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upd = 1;
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}
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}
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/* Computes virtualsize... we try to guess, actually :O */
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for (t = 0; t < j - 1; t++) {
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if (usects[t].vsz != usects[t + 1].rva - usects[t].rva)
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usects[t].vsz = usects[t + 1].rva - usects[t].rva;
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}
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/*
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* Our encryption is pathetic and out software is lame but
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* we need to claim it's unbreakable.
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* So why dont we just mangle the imports and encrypt the EP?!
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*/
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/* Decrypts old entrypoint if we got enough clues */
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if (enc_ep) {
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uint32_t virtaddr = pep + 5 + Imagebase, tmpep;
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int rndm = 0, dummy = 1;
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char *thunk = adjbuf + irva;
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char *imports;
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if (version == 2) { /* 2.2 onley */
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while (dummy && CLI_ISCONTAINED(buf, bufsz, thunk, 4)) {
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uint32_t api;
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if (!cli_readint32(thunk)) {
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workdone = 1;
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break;
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}
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imports = adjbuf + cli_readint32(thunk);
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thunk += 4;
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dummy = 0;
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while (CLI_ISCONTAINED(buf, bufsz, imports, 4)) {
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dummy = 0;
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imports += 4;
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if (!(api = cli_readint32(imports - 4))) {
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dummy = 1;
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break;
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}
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if ((api != (api | 0x80000000)) && mangled && --rndm < 0) {
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api = virtaddr;
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virtaddr += 5; /* EB + 1 double */
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rndm = virtaddr & 7;
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} else {
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api = 0xbff01337; /* KERNEL32!leet */
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}
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if (sections[sectcount - 1].rva + Imagebase < api)
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enc_ep--;
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if (api < virtaddr)
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enc_ep--;
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tmpep = (enc_ep & 0xfffffff8) >> 3 & 0x1fffffff;
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enc_ep = (enc_ep & 7) << 29 | tmpep;
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}
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}
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} else
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workdone = 1;
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enc_ep = pep + 5 + enc_ep;
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if (workdone == 1) {
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cli_dbgmsg("Petite: Old EP: %x\n", enc_ep);
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} else {
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enc_ep = usects[0].rva;
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cli_dbgmsg("Petite: In troubles while attempting to decrypt old EP, using bogus %x\n", enc_ep);
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}
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}
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/* Let's compact data */
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for (t = 0; t < j; t++) {
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usects[t].raw = (t > 0) ? (usects[t - 1].raw + usects[t - 1].rsz) : 0;
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if (usects[t].rsz != 0) {
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if (CLI_ISCONTAINED(buf, bufsz, buf + usects[t].raw, usects[t].rsz)) {
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memmove(buf + usects[t].raw, adjbuf + usects[t].rva, usects[t].rsz);
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} else {
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cli_dbgmsg("Petite: Skipping section %d, Raw: %x, RSize:%x\n", t, usects[t].raw, usects[t].rsz);
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usects[t].raw = t > 0 ? usects[t - 1].raw : 0;
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usects[t].rsz = 0;
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}
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}
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}
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/* Showtime!!! */
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cli_dbgmsg("Petite: Sections dump:\n");
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for (t = 0; t < j; t++)
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cli_dbgmsg("Petite: .SECT%d RVA:%x VSize:%x ROffset: %x, RSize:%x\n", t, usects[t].rva, usects[t].vsz, usects[t].raw, usects[t].rsz);
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if (!cli_rebuildpe(buf, usects, j, Imagebase, enc_ep, ResRva, ResSize, desc)) {
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cli_dbgmsg("Petite: Rebuilding failed\n");
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free(usects);
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return 1;
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}
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free(usects);
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return 0;
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}
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size = srva & 0x7fffffff;
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if (srva != size) { /* Test and clear bit 31 */
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check4resources = 0;
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/*
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Enumerates each petite data section
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I should get here once ot twice:
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- 1 time for the resource section (if present)
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- 1 time for the all_the_rest section
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*/
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if (!CLI_ISCONTAINED(buf, bufsz, packed + 4, 8)) {
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if (usects)
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free(usects);
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return 1;
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}
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/* Save the end of current packed section for later use */
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bottom = cli_readint32(packed + 8) + 4;
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ssrc = adjbuf + cli_readint32(packed + 4) - (size - 1) * 4;
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ddst = adjbuf + cli_readint32(packed + 8) - (size - 1) * 4;
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if (!CLI_ISCONTAINED(buf, bufsz, ssrc, size * 4) || !CLI_ISCONTAINED(buf, bufsz, ddst, size * 4)) {
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if (usects)
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free(usects);
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return 1;
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}
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/* Copy packed data to the end of the current packed section */
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memmove(ddst, ssrc, size * 4);
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packed += 0x0c;
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} else {
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uint32_t check1, check2;
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uint8_t mydl = 0;
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uint8_t goback;
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unsigned int q;
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/* Unpack each original section in turn */
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if (!CLI_ISCONTAINED(buf, bufsz, packed + 4, 8)) {
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if (usects)
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free(usects);
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return 1;
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}
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size = cli_readint32(packed + 4); /* How many bytes to unpack */
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thisrva = cli_readint32(packed + 8); /* RVA of the original section */
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packed += 0x10;
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if (j >= 96) {
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cli_dbgmsg("Petite: maximum number of sections exceeded, giving up.\n");
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free(usects);
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return 1;
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}
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/* Alloc 1 more struct */
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if (!(tmpsct = cli_realloc(usects, sizeof(struct cli_exe_section) * (j + 1)))) {
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if (usects)
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free(usects);
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return 1;
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}
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usects = (struct cli_exe_section *)tmpsct;
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/* Save section spex for later rebuilding */
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usects[j].rva = thisrva;
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usects[j].rsz = size;
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if ((int)(bottom - thisrva) > 0)
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usects[j].vsz = bottom - thisrva;
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else
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usects[j].vsz = size;
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usects[j].raw = 0; /* Cheaper than memset */
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if (!size) { /* That's a ghost section! reloc any1? :P */
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j++;
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continue;
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}
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ssrc = adjbuf + srva;
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ddst = adjbuf + thisrva;
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/* Last petite section (unpacked 1st) could contain unpacked data
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* (eg the icon): let's fix the rva
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*/
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for (q = 0; q < sectcount; q++) {
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if (!CLI_ISCONTAINED(sections[q].rva, sections[q].vsz, usects[j].rva, usects[j].vsz))
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continue;
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if (!check4resources) {
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usects[j].rva = sections[q].rva;
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usects[j].rsz = thisrva - sections[q].rva + size;
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}
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break;
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}
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if (q == sectcount) {
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free(usects);
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return 1;
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}
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/* Increase count of unpacked sections */
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j++;
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/* Setup some crap for later checks */
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if (size < 0x10000) {
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check1 = 0x0FFFFC060;
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check2 = 0x0FFFFFC60;
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goback = 5;
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} else if (size < 0x40000) {
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check1 = 0x0FFFF8180;
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check2 = 0x0FFFFF980;
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goback = 7;
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} else {
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check1 = 0x0FFFF8300;
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check2 = 0x0FFFFFB00;
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goback = 8;
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}
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/*
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* NOTE: on last loop we get esi=edi=ImageBase (which is not writeable)
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* The movsb on the next line causes the iat_rebuild_and_decrypt_oldEP()
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|
|
* func to get called instead... ehehe very smart ;)
|
||
|
|
*/
|
||
|
|
|
||
|
|
if (!CLI_ISCONTAINED(buf, bufsz, ssrc, 1) || !CLI_ISCONTAINED(buf, bufsz, ddst, 1)) {
|
||
|
|
free(usects);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
size--;
|
||
|
|
*ddst++ = *ssrc++; /* eheh u C gurus gotta luv these monsters :P */
|
||
|
|
backbytes = 0;
|
||
|
|
oldback = 0;
|
||
|
|
|
||
|
|
/* No surprises here... NRV any1??? ;) */
|
||
|
|
while (size > 0) {
|
||
|
|
oob = doubledl(&ssrc, &mydl, buf, bufsz);
|
||
|
|
if (oob == -1) {
|
||
|
|
free(usects);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
if (!oob) {
|
||
|
|
if (!CLI_ISCONTAINED(buf, bufsz, ssrc, 1) || !CLI_ISCONTAINED(buf, bufsz, ddst, 1)) {
|
||
|
|
free(usects);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
*ddst++ = (char)((*ssrc++) ^ (size & 0xff));
|
||
|
|
size--;
|
||
|
|
} else {
|
||
|
|
addsize = 0;
|
||
|
|
backbytes++;
|
||
|
|
while (1) {
|
||
|
|
if ((oob = doubledl(&ssrc, &mydl, buf, bufsz)) == -1) {
|
||
|
|
free(usects);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
if (backbytes >= INT_MAX / 2) {
|
||
|
|
free(usects);
|
||
|
|
cli_dbgmsg("Petite: probably invalid file\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
backbytes = backbytes * 2 + oob;
|
||
|
|
if ((oob = doubledl(&ssrc, &mydl, buf, bufsz)) == -1) {
|
||
|
|
free(usects);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
if (!oob)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
backbytes -= 3;
|
||
|
|
if (backbytes >= 0) {
|
||
|
|
backsize = goback;
|
||
|
|
do {
|
||
|
|
if ((oob = doubledl(&ssrc, &mydl, buf, bufsz)) == -1) {
|
||
|
|
free(usects);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
if (backbytes >= INT_MAX / 2) {
|
||
|
|
free(usects);
|
||
|
|
cli_dbgmsg("Petite: probably invalid file\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
backbytes = backbytes * 2 + oob;
|
||
|
|
backsize--;
|
||
|
|
} while (backsize);
|
||
|
|
backbytes ^= 0xffffffff;
|
||
|
|
addsize += 1 + (backbytes < (int)check2) + (backbytes < (int)check1);
|
||
|
|
oldback = backbytes;
|
||
|
|
} else {
|
||
|
|
backsize = backbytes + 1;
|
||
|
|
backbytes = oldback;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((oob = doubledl(&ssrc, &mydl, buf, bufsz)) == -1) {
|
||
|
|
free(usects);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
backsize = backsize * 2 + oob;
|
||
|
|
if ((oob = doubledl(&ssrc, &mydl, buf, bufsz)) == -1) {
|
||
|
|
free(usects);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
backsize = backsize * 2 + oob;
|
||
|
|
if (!backsize) {
|
||
|
|
backsize++;
|
||
|
|
while (1) {
|
||
|
|
if ((oob = doubledl(&ssrc, &mydl, buf, bufsz)) == -1) {
|
||
|
|
free(usects);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
backsize = backsize * 2 + oob;
|
||
|
|
if ((oob = doubledl(&ssrc, &mydl, buf, bufsz)) == -1) {
|
||
|
|
free(usects);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
if (!oob)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
backsize += 2;
|
||
|
|
}
|
||
|
|
backsize += addsize;
|
||
|
|
size -= backsize;
|
||
|
|
if (!CLI_ISCONTAINED(buf, bufsz, ddst, backsize) || !CLI_ISCONTAINED(buf, bufsz, ddst + backbytes, backsize)) {
|
||
|
|
free(usects);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
while (backsize--) {
|
||
|
|
*ddst = *(ddst + backbytes);
|
||
|
|
ddst++;
|
||
|
|
}
|
||
|
|
backbytes = 0;
|
||
|
|
backsize = 0;
|
||
|
|
} /* else */
|
||
|
|
} /* while(ebx) */
|
||
|
|
|
||
|
|
/* Any lame petite code here? If so let's strip it
|
||
|
|
* We've done version adjustments already, see above
|
||
|
|
*/
|
||
|
|
|
||
|
|
if (j) {
|
||
|
|
int strippetite = 0;
|
||
|
|
uint32_t reloc;
|
||
|
|
|
||
|
|
/* LONG MAGIC = 33C05E64 8B188B1B 8D63D65D */
|
||
|
|
if (usects[j - 1].rsz > grown &&
|
||
|
|
CLI_ISCONTAINED(buf, bufsz, ddst - grown + 5 + 0x4f, 8) &&
|
||
|
|
cli_readint32(ddst - grown + 5 + 0x4f) == 0x645ec033 &&
|
||
|
|
cli_readint32(ddst - grown + 5 + 0x4f + 4) == 0x1b8b188b) {
|
||
|
|
reloc = 0;
|
||
|
|
strippetite = 1;
|
||
|
|
}
|
||
|
|
if (!strippetite &&
|
||
|
|
usects[j - 1].rsz > grown + skew &&
|
||
|
|
CLI_ISCONTAINED(buf, bufsz, ddst - grown + 5 + 0x4f - skew, 8) &&
|
||
|
|
cli_readint32(ddst - grown + 5 + 0x4f - skew) == 0x645ec033 &&
|
||
|
|
cli_readint32(ddst - grown + 5 + 0x4f + 4 - skew) == 0x1b8b188b) {
|
||
|
|
reloc = skew; /* If the original exe had a .reloc were skewed */
|
||
|
|
strippetite = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (strippetite && CLI_ISCONTAINED(buf, bufsz, ddst - grown + 0x0f - 8 - reloc, 8)) {
|
||
|
|
uint32_t test1, test2;
|
||
|
|
|
||
|
|
/* REMINDER: DON'T BPX IN HERE U DUMBASS!!!!!!!!!!!!!!!!!!!!!!!! */
|
||
|
|
test1 = cli_readint32(ddst - grown + 0x0f - 8 - reloc) ^ 0x9d6661aa;
|
||
|
|
test2 = cli_readint32(ddst - grown + 0x0f - 4 - reloc) ^ 0xe908c483;
|
||
|
|
|
||
|
|
cli_dbgmsg("Petite: Found petite code in sect%d(%x). Let's strip it.\n", j - 1, usects[j - 1].rva);
|
||
|
|
if (test1 == test2 && CLI_ISCONTAINED(buf, bufsz, ddst - grown + 0x0f - reloc, 0x1c0 - 0x0f + 4)) {
|
||
|
|
irva = cli_readint32(ddst - grown + 0x121 - reloc);
|
||
|
|
enc_ep = cli_readint32(ddst - grown + 0x0f - reloc) ^ test1;
|
||
|
|
mangled = ((uint32_t)cli_readint32(ddst - grown + 0x1c0 - reloc) != 0x90909090); /* FIXME: Magic's too short??? */
|
||
|
|
cli_dbgmsg("Petite: Encrypted EP: %x | Array of imports: %x\n", enc_ep, irva);
|
||
|
|
}
|
||
|
|
usects[j - 1].rsz -= grown + reloc;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
check4resources++;
|
||
|
|
} /* outer else */
|
||
|
|
} /* while true */
|
||
|
|
}
|