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

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Message-ID: <CAAHK0WR10LLqsg_3dPN7+H_R0++JgGttc=oWNaDdv1ggwqAz1Q@mail.gmail.com>
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

Disclaimer: The information contained within this advisory is supplied
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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
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handling or the downloading of ANY Malware mentioned on this website or
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