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ShellCode_Aplib.c
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213 lines (170 loc) · 3.93 KB
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// ShellCode_Aplib.cpp : 定义控制台应用程序的入口点。
//
#include <stdio.h>
#include <tchar.h>
#include <stdint.h>
#ifndef APLIB_ERROR
# define APLIB_ERROR ((unsigned int) (-1))
#endif // APLIB_ERROR
/* aplib v 1.1.1*/
/* internal data structure */
struct APDSTATE {
const unsigned char *source;
unsigned char *destination;
unsigned int tag;
unsigned int bitcount;
};
#ifdef __cplusplus
extern "C" {
#endif // __cplusplus
unsigned int __cdecl aplib_entry(const void *source, unsigned int srclen, void *destination, unsigned int dstlen);
unsigned int aplib_main(const void *source, unsigned int srclen, void *destination, unsigned int dstlen);
void aplib_end();
#ifdef __cplusplus
}
#endif // __cplusplus
#pragma optimize("ts", on)
unsigned int __cdecl aplib_entry(const void *source, unsigned int srclen, void *destination, unsigned int dstlen) {
return aplib_main(source, srclen, destination, dstlen);
}
static unsigned int aP_getbit(struct APDSTATE *ud)
{
unsigned int bit;
/* check if tag is empty */
if (!ud->bitcount--) {
/* load next tag */
ud->tag = *ud->source++;
ud->bitcount = 7;
}
/* shift bit out of tag */
bit = (ud->tag >> 7) & 0x01;
ud->tag <<= 1;
return bit;
}
static unsigned int aP_getgamma(struct APDSTATE *ud)
{
unsigned int result = 1;
/* input gamma2-encoded bits */
do {
result = (result << 1) + aP_getbit(ud);
} while (aP_getbit(ud));
return result;
}
unsigned int aplib_main(const void *source, unsigned int srclen, void *destination, unsigned int dstlen) {
struct APDSTATE ud;
unsigned int offs, len, R0, LWM;
int done;
int i;
ud.source = (const unsigned char *)source;
ud.destination = (unsigned char *)destination;
ud.bitcount = 0;
R0 = (unsigned int)-1;
LWM = 0;
done = 0;
/* first b
A6F0
yte verbatim */
*ud.destination++ = *ud.source++;
/* main decompression loop */
while (!done) {
if (aP_getbit(&ud)) {
if (aP_getbit(&ud)) {
if (aP_getbit(&ud)) {
offs = 0;
for (i = 4; i; i--) {
offs = (offs << 1) + aP_getbit(&ud);
}
if (offs) {
*ud.destination = *(ud.destination - offs);
ud.destination++;
}
else {
*ud.destination++ = 0x00;
}
LWM = 0;
}
else {
offs = *ud.source++;
len = 2 + (offs & 0x0001);
offs >>= 1;
if (offs) {
for (; len; len--) {
*ud.destination = *(ud.destination - offs);
ud.destination++;
}
}
else {
done = 1;
}
R0 = offs;
LWM = 1;
}
}
else {
offs = aP_getgamma(&ud);
if ((LWM == 0) && (offs == 2)) {
offs = R0;
len = aP_getgamma(&ud);
for (; len; len--) {
*ud.destination = *(ud.destination - offs);
ud.destination++;
}
}
else {
if (LWM == 0) {
offs -= 3;
}
else {
offs -= 2;
}
offs <<= 8;
offs += *ud.source++;
len = aP_getgamma(&ud);
if (offs >= 32000) {
len++;
}
if (offs >= 1280) {
len++;
}
if (offs < 128) {
len += 2;
}
for (; len; len--) {
*ud.destination = *(ud.destination - offs);
ud.destination++;
}
R0 = offs;
}
LWM = 1;
}
}
else {
*ud.destination++ = *ud.source++;
LWM = 0;
}
}
return (unsigned int)(ud.destination - (unsigned char *)destination);
}
void aplib_end() {
}
#pragma optimize("ts", off)
#ifdef _WIN64
# define OUT_FILE_NAME "aplib_x64.bin"
#else
# define OUT_FILE_NAME "aplib_x86.bin"
#endif
int _tmain(int argc, _TCHAR* argv[]) {
uint8_t *start = (uint8_t *)aplib_entry;
uint8_t *end = (uint8_t *)aplib_end;
size_t size = end - start;
printf("[*] aplib shellcode start = %p, end = %p, size = %d\n", start, end, size);
FILE *file = 0;
fopen_s(&file, OUT_FILE_NAME, "wb");
if (file == 0) {
printf("[!] create out file error. file name = %s\n", OUT_FILE_NAME);
return 0;
}
fwrite(start, 1, size, file);
fflush(file);
fclose(file);
printf("[*] generate aplib shellcode sucess.\n");
return 0;
}