Backdoor.Win32.Bifrose.ahvb Insecure Permissions

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/39e22b8b19f6aed59d2def00c4228d56.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.Bifrose.ahvb  
Vulnerability: Insecure Permissions  
Description: The backdoor creates an insecure dir named "Temp" under c:\ drive, granting change (C) permissions to the authenticated user group.  
Type: PE32  
MD5: 39e22b8b19f6aed59d2def00c4228d56  
Vuln ID: MVID-2021-0090  
Dropped files: iwbfh482008c.exe  
Disclosure: 02/15/2021  
  
Exploit/PoC:  
C:\>cacls \Temp  
C:\Temp 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:\>dir \Temp  
Volume in drive C has no label.  
  
Directory of C:\Temp  
  
02/14/2021 10:01 PM <DIR> .  
02/14/2021 10:01 PM <DIR> ..  
02/14/2021 10:01 PM 689,664 iwbfh482008c.exe  
1 File(s) 689,664 bytes  
  
  
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