Suspicious Kerberos RC4 Ticket Encryption (via security)

title: Suspicious Kerberos RC4 Ticket Encryption (via security)
id: fdd1aded-e9db-5ec8-aadd-d056a2cb0c45
status: stable
description: This rule detects service ticket requests using RC4 encryption type
references:
    - https://attack.mitre.org/techniques/T1558/003/
    - https://adsecurity.org/?p=3458
    - https://www.trimarcsecurity.com/single-post/TrimarcResearch/Detecting-Kerberoasting-Activity
author: Huntrule Team
date: 2026-03-05
tags:
    - attack.credential-access
    - attack.t1558.003
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 4769
        TicketOptions: '0x40810000'
        TicketEncryptionType: '0x17'
    reduction:
        ServiceName|endswith: '$'
    condition: selection and not reduction
falsepositives:
    - Unknown
level: medium