Potential KDC RC4-HMAC Downgrade Exploit - CVE-2022-37966

 1title: Potential KDC RC4-HMAC Downgrade Exploit - CVE-2022-37966
 2id: e6f81941-b1cd-4766-87db-9fc156f658ee
 3status: test
 4description: Detects the exploitation of a security bypass and elevation of privilege vulnerability with Authentication Negotiation by using weak RC4-HMAC negotiation
 5references:
 6    - https://support.microsoft.com/en-us/topic/kb5021131-how-to-manage-the-kerberos-protocol-changes-related-to-cve-2022-37966-fd837ac3-cdec-4e76-a6ec-86e67501407d
 7author: Florian Roth (Nextron Systems)
 8date: 2022-11-09
 9modified: 2025-11-03
10tags:
11    - attack.privilege-escalation
12    - detection.emerging-threats
13    - cve.2022-37966
14logsource:
15    product: windows
16    service: system
17detection:
18    selection:
19        EventID: 42
20        Provider_Name:
21            - 'Kerberos-Key-Distribution-Center'
22            - 'Microsoft-Windows-Kerberos-Key-Distribution-Center'
23        Level: 2  # Error
24    condition: selection
25falsepositives:
26    - Unknown
27level: high