full-disclosure - [FD] Backdoor.Win32.Mellpon.b / Remote Unauthenticated Information Disclosure

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Date: Thu, 16 Dec 2021 21:51:50 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Mellpon.b / Remote Unauthenticated Information
	Disclosure

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/e499a4c359a8cc46e641f39c0ed548f9.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Mellpon.b
Vulnerability: Remote Unauthenticated Information Disclosure
Description: The malware listens on TCP port 80 and creates a dir named
"tanaka" with a file named C.html, the HTML file contains a list of all
dirs on the system and their contents. Third-party attackers who can reach
an infected system can view the screen dumps taken periodically as well as
view all directories and files on the system. The screen dumps are in a JPG
file named "~ss.jpg" and can be accessed by URL http://x.x.x.x/~ss.jpg.
Type: PE32
MD5: e499a4c359a8cc46e641f39c0ed548f9
Vuln ID: MVID-2021-0430
Disclosure: 12/16/2021

Exploit/PoC:
1) Open a web browser to the infected host and navigate to C.html or
~ss.jpg.

Screenshots of the infected host.
http://x.x.x.x/~ss.jpg

2) All files and directory contents.
http://x.x.x.x/C.html

2021/10/13 20:24          28131582 C.html

../
C:/
2016/11/21 15:06    DIR          $Recycle.Bin/
2018/03/13 15:36    DIR          Boot/
2016/11/21 11:28    DIR          Documents and Settings/
2021/12/13 20:21    DIR          dump/
2017/12/13 20:41    DIR          PerfLogs/
2021/12/13 20:17    DIR          Program Files/
2021/10/03 20:49    DIR          Program Files (x86)/
2021/10/03 21:12    DIR          ProgramData/
2018/03/13 00:44    DIR          Recovery/
2018/03/13 00:45    DIR          System Volume Information/
2018/03/13 00:45    DIR          Users/
2021/07/07 21:14    DIR          Windows/
2018/03/01 01:53            398082 bootmgr
2017/09/29 08:41                 1 BOOTNXT
2018/03/13 00:40              8192 BOOTSECT.BAK
2021/10/12 21:10         671088640 pagefile.sys
2021/10/12 21:10          16777216 swapfile.sys
C:/$Recycle.Bin/

etc...

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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