Rule Content
- title: Suspicious Kerberos RC4 Ticket Encryption
id: 496a0e47-0a33-4dca-b009-9e6ca3591f39
status: experimental
references:
- https://adsecurity.org/?p=3458
- https://www.trimarcsecurity.com/single-post/TrimarcResearch/Detecting-Kerberoasting-Activity
tags:
- attack.credential_access
- attack.t1208
description: Detects service ticket requests using RC4 encryption type
logsource:
product: windows
service: security
category: null
detection:
selection:
EventID: 4769
TicketOptions: '0x40810000'
TicketEncryptionType: '0x17'
reduction:
- ServiceName: $*
condition: selection and not reduction
falsepositives:
- Service accounts used on legacy systems (e.g. NetApp)
- Windows Domains with DFL 2003 and legacy systems
level: medium