Possible AS-REP Roasting through Kerberos TGT Requests (via security)

title: Possible AS-REP Roasting through Kerberos TGT Requests (via security)
id: 084a95a1-26af-5262-ad66-ee8dd291242e
status: stable
description: This rule detects anomalous Kerberos TGT requests with pre-authentication disabled (Pre-Authentication Type = 0) and Ticket Encryption Type (0x17) i.e, RC4-HMAC. This may indicate an AS-REP Roasting attack, where adversaries request AS-REP messages for accounts without pre-authentication and attempt to crack the encrypted ticket offline to recover user passwords.
references:
    - https://medium.com/system-weakness/detecting-as-rep-roasting-attacks-b5b3965f9714
    - https://www.picussecurity.com/resource/blog/as-rep-roasting-attack-explained-mitre-attack-t1558.004
author: Huntrule Team
date: 2026-05-13
tags:
    - attack.credential-access
    - attack.t1558.004
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 4768
        TicketEncryptionType: '0x17'
        ServiceName: 'krbtgt'
        PreAuthType: 0
    condition: selection
falsepositives:
    - Unknown
level: medium