full-disclosure - [FD] Backdoor.Win32.Plugx / Insecure Permissions

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Message-ID: <CAAHK0WTqRkW4Sce5MJrGFsnis=woAZaU66t_D=KJ1QWYkWhpGQ@mail.gmail.com>
Date: Mon, 17 Jun 2024 23:57:10 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Plugx / Insecure Permissions

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2024
Original source:
https://malvuln.com/advisory/eeb631127f1b9fb3d13d209d8e675634.txt
Contact: malvuln13@...il.com
Media: x.com/malvuln

Threat: Backdoor.Win32.Plugx
Vulnerability: Insecure Permissions
Family: Plugx
Type: PE32
MD5: eeb631127f1b9fb3d13d209d8e675634
SHA256: c2804080c3f45e8232b3e955611f56c9ba513a7845ddad56a588c4191d139990
Vuln ID: MVID-2024-0686
Disclosure: 06/17/2024
Description: The PlugX malware installs a service "McAfeeOEMInfoOME"
which runs as SYSTEM. It also creates a hidden directory
"TaskSchedulerome" under C:\ProgramData, granting full (F) permissions
to the Everyone user group. Any user can replace the PE files dropped
by the malware to disable it or replace it with their own executable.
Then wait for a privileged user to logon to the infected machine to
potentially escalate privileges.

Exploit/PoC:
cacls C:\ProgramData\TaskSchedulerome\mcf.exe
ProgramData\TaskSchedulerome\mcf.exe Everyone:(OI)(CI)F

attrib -s -h C:\ProgramData\TaskSchedulerome

dir /a C:\ProgramData\TaskSchedulerome

 Directory of C:\ProgramData\TaskSchedulerome

02/10/2018  01:21 AM           116,493 mcf.ep
02/10/2018  01:21 AM           140,576 mcf.exe
02/10/2018  01:21 AM       167,776,542 mcutil.dll
               3 File(s)    168,033,611 bytes
               2 Dir(s)  67,722,203,136 bytes free

Disclaimer: The information contained within this advisory is supplied
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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
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