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之前看卡巴的驱动，发现它的kl1.sys会在boot时读取参数，然后将drivers下的.dat驱动解密并自己分配内存加载（加载的代码填充iat部分有bug）
写了个解密小程序：
只试了klick.sys
#include "stdafx.h"
#include "windows.h"
#include "winbase.h"
#include "malloc.h"
unsigned char data[256] = {
0x42, 0xa3, 0x53, 0x04, 0x4d, 0x4b, 0xa3, 0xc4, 0xec, 0xf8, 0xe5, 0x41, 0x9d, 0xef, 0xae, 0x46,
0x95, 0x59, 0x7d, 0xf3, 0x98, 0xbd, 0xdc, 0xd4, 0x1f, 0xe9, 0xc1, 0xd9, 0xfb, 0xf1, 0xe9, 0x8d,
0x85, 0x0b, 0x7b, 0x14, 0x56, 0x12, 0x33, 0xcc, 0xfd, 0x47, 0x48, 0xf5, 0x0c, 0x4c, 0x24, 0xc2,
0x3d, 0x2f, 0xb6, 0xc4, 0x66, 0xd3, 0xdd, 0x73, 0x54, 0xae, 0xe4, 0x4f, 0xf1, 0x1b, 0x94, 0xfc,
0xbc, 0x4e, 0x7c, 0x66, 0xf4, 0x90, 0xcd, 0xa1, 0xa2, 0xf7, 0xb6, 0xdd, 0x83, 0x57, 0x04, 0x7c,
0x10, 0x14, 0x20, 0x10, 0xf4, 0x3c, 0x2c, 0x7a, 0x87, 0x30, 0xab, 0x3c, 0xde, 0x86, 0x31, 0xce,
0x4d, 0x63, 0xad, 0xcb, 0xb3, 0x13, 0x94, 0xfa, 0x5b, 0xd5, 0x88, 0x98, 0x06, 0x29, 0xeb, 0xa0,
0x20, 0x3a, 0xdb, 0x7a, 0x80, 0xbd, 0x1d, 0x08, 0xc3, 0x05, 0x56, 0xca, 0x44, 0xa1, 0xab, 0x3a,
0x41, 0x43, 0x6a, 0x2c, 0x64, 0x27, 0x53, 0xcd, 0xe9, 0x09, 0x45, 0x16, 0x46, 0xaf, 0xbe, 0xb8,
0x0d, 0x8d, 0xba, 0x1b, 0xe1, 0xf3, 0xd2, 0x50, 0xaa, 0xd1, 0x3c, 0xca, 0xea, 0x8d, 0x10, 0xe5,
0x59, 0x2c, 0xa1, 0x21, 0x9b, 0x08, 0xdb, 0x2e, 0x2c, 0x62, 0x6e, 0xff, 0xb1, 0xeb, 0xaa, 0x2d,
0x90, 0xff, 0x0c, 0x59, 0x7b, 0x3a, 0x08, 0xec, 0x0a, 0xc9, 0xc3, 0x4c, 0x63, 0x4f, 0x73, 0xc1,
0xc8, 0x4e, 0xa5, 0x9c, 0xb0, 0xee, 0xf4, 0xee, 0x4d, 0x93, 0x13, 0x67, 0x9e, 0x3d, 0x4d, 0xa6,
0x01, 0x5f, 0x1f, 0x61, 0x8f, 0x9e, 0x57, 0xac, 0x44, 0xb5, 0xfb, 0x40, 0x1e, 0xfc, 0x00, 0xae,
0xda, 0x36, 0xea, 0x49, 0x64, 0x05, 0x1a, 0x1b, 0x4e, 0xd4, 0x29, 0x4d, 0xbb, 0x81, 0x7d, 0x6b,
0xc4, 0xf2, 0x39, 0x98, 0xc9, 0x2f, 0xb7, 0xcb, 0xbd, 0x6d, 0xfc, 0x3e, 0xc9, 0x3e, 0x20, 0xab
};
int main(int argc, char* argv[])
{
file* file ;
if (argc != 2)
{
printf("input sys name!\n");
return 0;
}
printf("decode drv file:%s\n" , argv[1]);
file = fopen(argv[1] , "r b");
fseek(file , 0, seek_end);
ulong t = ftell(file);
printf("file length x\n" , t);
ulong u =(ulong)malloc(t);
fseek(file , 0 , seek_set);
dword z = fread((pvoid)u , 1 , t , file);
fseek(file , 0 , seek_set);
ulong i ;
for (i = 0 ; i < t ; i )
{
__asm
{
push edx
push ecx
mov edx , u
mov ecx , i
mov eax , i
and eax , 0xff
mov al , data[eax]
xor [edx ecx] , al
pop ecx
pop edx
}
}
printf("%u", t);
fwrite((pvoid)u , 1 , t , file);
fclose(file);
printf("ok!\n");
return 0 ;
}
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