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 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).