Backdoor.Win32.DarkKomet.apcc / Insecure Permissions

[malvuln <malvuln13 () gmail com>]

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


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