Saturday, February 20, 2021

Backdoor.Win32.DarkKomet.bhfh Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/2e507b75c0df0fcb2f9a85f4a0c1bc04.txt
Contact: [email protected]
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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