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Date: Tue, 6 Sep 2022 20:08:15 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan.Win32.Autoit.fhj / Insecure Permissions

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
https://malvuln.com/advisory/d871836f77076eeed87eb0078c1911c7.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan.Win32.Autoit.fhj
Vulnerability: Insecure Permissions
Description: The malware writes two hidden DLL files "vp8decoder.dll" and
"vp8encoder.dll" to its installation directory 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.
Family: Autoit
Type: PE32
MD5: d871836f77076eeed87eb0078c1911c7
Vuln ID: MVID-2022-0637
Disclosure: 09/06/2022

Exploit/PoC:
insecure dir permissions for two DLL's with bunch hidden files

C:\Program Files (x86)\XPS Rasterization Service Component>attrib -s -h *
C:\Program Files (x86)\XPS Rasterization Service Component>cacls *
C:\Program Files (x86)\XPS Rasterization Service Component\vp8decoder.dll
Everyone:F
C:\Program Files (x86)\XPS Rasterization Service Component\vp8encoder.dll
Everyone:F


Directory of C:\Program Files (x86)\XPS Rasterization Service Component

09/05/2022  12:18 AM             1,165 Log(05.09.2022).txt
09/05/2022  12:15 AM           803,971 Screen(00_15).jpg
02/21/2017  02:58 PM             2,665 settings.dat
07/15/2015  12:19 PM           143,568 vp8decoder.dll
07/15/2015  12:19 PM           539,856 vp8encoder.dll
09/05/2022  12:15 AM         2,052,816 xps.exe
02/21/2017  01:24 PM         2,031,104 xservice.exe
               7 File(s)      5,575,145 bytes



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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