Discovery / credits: Malvuln - malvuln.com (c) 2021 Original source: https://malvuln.com/advisory/66ef21e8d1cf30dce6e084a9e306c18f.txt Contact: malvuln13@gmail.com Media: twitter.com/malvuln Threat: Backdoor.Win32.RemoteManipulator.fdo Vulnerability: Insecure Permissions Description: The backdoor creates an insecure randomly named hidden dir with a .tmp ext E.g. 8RK86.tmp and grants change (C) permissions to the authenticated user group. Standard users can rename the malware and reboot to disable it or replace with their own executable to escalate privileges when a privileged user logs on to the infected machine. Type: PE32 MD5: 66ef21e8d1cf30dce6e084a9e306c18f Vuln ID: MVID-2021-0116 Dropped files: settings.dat, vp8encoder.dll, xpcomp.exe Disclosure: 03/01/2021 Exploit/PoC: C:\>cacls 4J83Z.tmp C:\4J83Z.tmp BUILTIN\Administrators:(OI)(CI)(ID)F NT AUTHORITY\SYSTEM:(OI)(CI)(ID)F BUILTIN\Users:(OI)(CI)(ID)R NT AUTHORITY\Authenticated Users:(ID)C NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C C:\>cd 4J83Z.tmp C:\4J83Z.tmp>dir Volume in drive C has no label. Directory of C:\4J83Z.tmp File Not Found C:\4J83Z.tmp>dir /a Volume in drive C has no label. Directory of C:\4J83Z.tmp 02/25/2021 05:55 PM 2,664 settings.dat 08/06/2017 06:51 AM 542,016 vp8encoder.dll 02/25/2021 05:55 PM 2,981,888 xpcomp.exe 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).