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

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Message-ID: <CAAHK0WR3QPMMDiPQ9=U5QqXW7dm=sSLfhDejAmKpVnoi8i_h8g@mail.gmail.com>
Date: Thu, 18 Feb 2021 20:52:33 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.DarkKomet.apcc / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/8c82de32ab2b407451b9fc054c09f717.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.DarkKomet.apcc
Vulnerability: Insecure Permissions
Description:  DarkKomet.apcc creates an insecure directory under c:\ drive
granting change (C) permissions to the authenticated user group and drops
an EXE named "msdcsc.exe" in that dir.
Type: PE32
MD5: 8c82de32ab2b407451b9fc054c09f717
Vuln ID: MVID-2021-0098
Dropped files: msdcsc.exe
Disclosure: 02/18/2021

Exploit/PoC:
C:\>cacls \MSDCSC
C:\MSDCSC 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 \MSDCSC
 Volume in drive C has no label.

 Directory of C:\MSDCSC
        ..
06/16/2012  12:27 PM         1,097,728 msdcsc.exe
               1 File(s)      1,097,728 bytes
               2 Dir(s)  48,289,648,640 bytes free

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
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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