Potential CVE-2021-42278 Exploitation Attempt

The attacker creates a computer object using those permissions with a password known to her. After that she clears the attribute ServicePrincipalName on the computer object. Because she created the object (CREATOR OWNER), she gets granted additional permissions and can do many changes to the object.

title: Potential CVE-2021-42278 Exploitation Attempt
id: 44bbff3e-4ca3-452d-a49a-6efa4cafa06f
related:
    - id: e80a0fee-1a62-4419-b31e-0d0db6e6013a
      type: similar
status: test
description: |
    The attacker creates a computer object using those permissions with a password known to her.
    After that she clears the attribute ServicePrincipalName on the computer object.
    Because she created the object (CREATOR OWNER), she gets granted additional permissions and can do many changes to the object.
references:
    - https://cloudbrothers.info/en/exploit-kerberos-samaccountname-spoofing/
author: frack113
date: 2021-12-15
modified: 2023-04-14
tags:
    - attack.credential-access
    - attack.t1558.003
    - cve.2021-42278
    - detection.emerging-threats
logsource:
    product: windows
    service: system
detection:
    selection:
        Provider_Name: 'Microsoft-Windows-Kerberos-Key-Distribution-Center'  # Active Directory
        EventID:
            - 35 # PAC without attributes
            - 36 # Ticket without a PAC
            - 37 # Ticket without Requestor
            - 38 # Requestor Mismatch
    condition: selection
falsepositives:
    - Unknown
level: medium

• T1558.003Kerberoasting

• https://cloudbrothers.info/en/exploit-kerberos-samaccountname-spoofing/↗