full-disclosure - [FD] Backdoor.Win32.DarkKomet.bhfh / Insecure Permissions

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Date: Thu, 18 Feb 2021 20:49:21 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.DarkKomet.bhfh / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/2e507b75c0df0fcb2f9a85f4a0c1bc04.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.DarkKomet.bhfh
Vulnerability: Insecure Permissions
Description: DarkKomet.bhfh creates a hidden insecure directory under c:\
drive granting change (C) permissions to the authenticated user group. The
backdoor also drops an EXE named "ÚÈÏÇáÑÍãä.exe in that dir.
Type: PE32
MD5: 2e507b75c0df0fcb2f9a85f4a0c1bc04
Vuln ID: MVID-2021-0097
Dropped files: ÚÈÏÇáÑÍãä.exe
Disclosure: 02/18/2021

Exploit/PoC:
C:\>dir /a \System
 Volume in drive C has no label.

 Directory of C:\System
         ..
06/14/2012  05:38 PM           730,112 ÚÈÏÇáÑÍãä.exe
               1 File(s)        730,112 bytes
               2 Dir(s)  48,290,029,568 bytes free

C:\>cacls \System
C:\System 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

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