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Backdoor.Win32.RemoteManipulator.brr MVID-2021-0067 Insecure Permissions

Backdoor.Win32.RemoteManipulator.brr MVID-2021-0067 Insecure Permissions
Posted Feb 3, 2021
Authored by malvuln | Site malvuln.com

Backdoor.Win32.RemoteManipulator.brr malware suffers from an insecure permissions vulnerability.

tags | exploit
systems | windows
SHA-256 | b836a103656b4dbc9eef3f283072de661687ed0343545df8874b5f7b2428c0b5

Backdoor.Win32.RemoteManipulator.brr MVID-2021-0067 Insecure Permissions

Change Mirror Download
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/717f316391b6a7b97fa160b0a627a413.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.RemoteManipulator.brr
Vulnerability: Insecure Permissions EoP
Description: This malware creates a dir named "eaKVB87.tmp" under c:\ and grants change (C) permissions to authenticated users group. This can result in EoP as any authenticated user can modify its dir.
Type: PE32
MD5: 717f316391b6a7b97fa160b0a627a413
Vuln ID: MVID-2021-0067
Dropped files: citoCavb.vbs, N0731337.bak, taskhosteo.exe, vp8encoder.dll
Disclosure: 02/02/2021


Exploit/PoC:
C:\>cacls C:\eaKVB87.tmp
C:\eaKVB87.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:\>cacls C:\eaKVB87.tmp\taskhosteo.exe
C:\eaKVB87.tmp\taskhosteo.exe BUILTIN\Administrators:(ID)F
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Users:(ID)R
NT AUTHORITY\Authenticated Users:(ID)C

Directory of c:\eaKVB87.tmp

03/27/2017 01:38 AM 42,320 citoCavb.vbs
01/27/2021 08:36 PM 0 N0731337.bak
03/21/2017 08:11 PM 3,968,512 taskhosteo.exe
09/01/2016 07:44 AM 1,639,336 vp8encoder.dll


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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