Backdoor.Win32.RemoteManipulator.brr Insecure Permissions

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/717f316391b6a7b97fa160b0a627a413.txt  
Contact: [email protected]  
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  
  
  
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