#include<windows.h>
unsigned char *CO_File;
DWORD size;
DWORD LoadFileToMem(LPCWSTR FilePath)
{
HANDLE hfile;
DWORD dw;

hfile = CreateFile(FilePath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hfile == INVALID_HANDLE_VALUE)
{
MessageBox(NULL, L"Error when file Handling", L"ERROR", 0);
CloseHandle(hfile);
return 0;
}

size = GetFileSize(hfile, NULL);
if (size == INVALID_FILE_SIZE) { MessageBox(NULL, L"Size of file not invalid", L"ERROR", 0);
CloseHandle(hfile);
return 0;
}
if ((CO_File = (unsigned char*)VirtualAlloc(NULL, size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE)) == NULL)
{
MessageBox(NULL, L"Can't allocate a memory for the file", L"ERROR", 0);
CloseHandle(hfile);
return 0;
}
if (!ReadFile(hfile, (LPVOID)CO_File, size, &dw, NULL))
{
MessageBox(NULL, L"Can't reading the file", L"ERROR", 0);
CloseHandle(hfile);
return 0;
}
CloseHandle(hfile);
return 0;
}
int Xor(LPSTR key)
{
int j = 0;
for (int i = 0 ; i<size ; i++)
{
CO_File[i] = CO_File[i] ^ key[j];
j++;
if (j== strlen(key))
{
j = 0;
}
}
return 0;
}
int WriteToFile()
{
DWORD dw;
HANDLE Ofile;
Ofile = CreateFile(L"C:\\Users\\zika\\Desktop\\test\\2.exe",GENERIC_WRITE,FILE_SHARE_READ,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0);
WriteFile(Ofile,CO_File,size,&dw,NULL);
CloseHandle(Ofile);
return 1;
}
int main()
{
LoadFileToMem(L"C:\\Users\\zika\\Desktop\\test\\1.exe");
Xor("zeraya");
WriteToFile();
return 0;
}