title: Kerberos Network Traffic RC4 Ticket Encryption
id: 503fe26e-b5f2-4944-a126-eab405cc06e5
status: experimental
date: 2020/02/12
description: Detects kerberos TGS request using RC4 encryption which may be indicative of kerberoasting
references:
    - https://adsecurity.org/?p=3458
tags:
    - attack.credential_access
    - attack.t1208 # an old one
    - attack.t1558.003
logsource:
    product: zeek
    service: kerberos
detection:
    selection:
        request_type: 'TGS'
        cipher: 'rc4-hmac'
    computer_acct:
        service: '$*'
    condition: selection and not computer_acct
falsepositives:
    - normal enterprise SPN requests activity
level: medium
