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Backdoor.Win32.DarkKomet.aspl / Insecure Permissions

CVE Category Price Severity
N/A CWE-532 Unknown High
Author Risk Exploitation Type Date
Unknown High Remote 2021-09-04
CPE
cpe:cpe:/a:darkkomet:backdoor:1.0
CVSS EPSS EPSSP
CVSS:4.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021090017

Below is a copy:

Backdoor.Win32.DarkKomet.aspl / Insecure Permissions
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/5c644104f96ccad7a8cf324c2e523530.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Backdoor.Win32.DarkKomet.aspl
Vulnerability: Insecure Permissions
Description: The malware creates an insecure dir under c:\ drive and grants change (C) permissions to the authenticated user group. Standard users can rename the executables dropped by the malware to disable it or replace it with their own executable. Then wait for a privileged user to logon to the infected machine to potentially escalate privileges.
Type: PE32
MD5: 5c644104f96ccad7a8cf324c2e523530
Vuln ID: MVID-2021-0320
Dropped files: winupdate.exe
Disclosure: 08/30/2021


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

 Directory of C:\Windupdt

07/05/2021  11:27 PM           245,760 winupdate.exe
               1 File(s)        245,760 bytes


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