Saturday, February 20, 2021

Backdoor.Win32.DarkKomet.apcc Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/8c82de32ab2b407451b9fc054c09f717.txt
Contact: [email protected]
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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