Original source: https://malvuln.com/advisory/4d10cd3fa86239ade05d2b741892b1e5_B.txt
Contact:
Media: twitter.com/malvuln
Threat: Backdoor.Win32.Coredoor.10.a
Vulnerability: Port Bounce Scan
Description: The malware listens on TCP port 21000. Third-party
attackers 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: 4d10cd3fa86239ade05d2b741892b1e5
Vuln ID: MVID-2021-0411
Dropped files: CFS.exe
Disclosure: 11/25/2021
Exploit/PoC:
nmap -n -Pn -b malvuln:
Starting Nmap 7.80 ( https://nmap.org ) at 2021-11-24 22:18 Pacific
Standard Time
Resolved FTP bounce attack proxy to 192.168.18.125
(192.168.18.125).
Attempting connection to
ftp://malvuln:
Connected:220 c400s FTP Server read...
Login credentials accepted by FTP server!
Initiating Bounce Scan at 22:18
Discovered open port 80/tcp on 192.168.18.237
Completed Bounce Scan at 22:18, 2.16s 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 11.30 seconds
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