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



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