from:MJ0011的内核驱动研究所

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:%sn" , argv[1]);
file = fopen(argv[1] , "r+b");
fseek(file , 0, SEEK_END);
ULONG t = ftell(file);
printf("file length %08xn" , 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 ;

}