Zeus mmbb builder v2.9.6.1 Config decoder

<?php
    function decode($data, $key) {
        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');
        $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
       
        mcrypt_generic_init($td, $key, $iv);
        mcrypt_generic($td, $data);
       
        $data = mdecrypt_generic($td, $data);
       
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
       
        return $data;
    }
   
    function visualDecrypt(&$data) {
        $len = strlen($data);
       
        if ($len > 0)
            for ($i = $len - 1; $i > 0; $i--)
                $data[$i] = chr(ord($data[$i]) ^ ord($data[$i - 1]));
    }
   
    $data    = file_get_contents('config.bin');
    $key     = md5('hasd7h12g1', true);
    $decoded = decode($data, $key);
   
    visualDecrypt($decoded);
   
    $size = strlen($decoded);
   
    header('Content-Type: application/octet-stream;');
    header('Content-Transfer-Encoding: binary');
    header('Content-Length: ' . $size);
    header('Content-Disposition: attachment; filename=config_decrypted.dll');
    header('Expires: 0');
    header('Cache-Control: no-cache, must-revalidate');
    header('Pragma: no-cache');
   
    echo($decoded);
   
    exit;
?>