full-disclosure - [FD] Backdoor.Win32.Onalf / Missing Authentication

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Message-ID: <CAAHK0WTJr38iZRn6D_YpsBXBA1MO4KyhF2d47bgnRVD36LCxFA@mail.gmail.com>
Date: Wed, 20 Jan 2021 22:03:23 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Onalf / Missing Authentication

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/ba815d409cd714c0eac010b5970f6408.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Onalf
Vulnerability: Missing Authentication
Description: WinRemoteShell (Onalf) listens for commands on TCP port
2020. Interestingly, it will only start listening once it can connect
outbound to SMTP port 25. Not much of a self respecting backdoor, as
it allows anyone to logon without requiring a password. After logon
you are greeted with Welcome to WinRemoteShell(c)Chernickevich
http://onehalf.hotmail.ru.
Type: PE32
MD5: ba815d409cd714c0eac010b5970f6408
Vuln ID: MVID-2021-0042
Disclosure: 01/20/2021

Exploit/PoC:
TELNET x.x.x.x 2020

Disclaimer: The information contained within this advisory is supplied
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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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