full-disclosure - [FD] Backdoor.Win32.Yoddos.an / Insecure Service Path

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Message-ID: <CAAHK0WRja2i7+t4MBvyP4VQhmu0T1RWu0qjK3mgmmCRFLrsaLg@mail.gmail.com>
Date: Tue, 5 Oct 2021 19:57:02 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Yoddos.an / Insecure Service Path

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/bf2417bf23a3b7ae2e44676882b4b9dd.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Yoddos.an
Vulnerability: Insecure Service Path
Description: The malware creates a service with an unquoted path.
Third party attackers who can place an arbitrary executable under c:\
drive can potentially undermine the integrity of the malware by having
it run theirs instead with SYSTEM privs.
Type: PE32
MD5: bf2417bf23a3b7ae2e44676882b4b9dd
Vuln ID: MVID-2021-0354
Dropped files: windowse.exe
Disclosure: 10/04/2021

Exploit/PoC:
sc qc windowse
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: windowse
        TYPE               : 10  WIN32_OWN_PROCESS
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 0   IGNORE
        BINARY_PATH_NAME   : C:\Program Files\Internet Explorer\windowse.exe
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : windowse
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem

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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