Sigma rule: Potential AS-REP Roasting via Kerberos TGT Requests

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-5042bd47ae06, updated 2025-07-04T00:00:00.000Z.

Rule

Title
Potential AS-REP Roasting via Kerberos TGT Requests
Status
experimental
Level
medium
Author
ANosir
Date
2025-05-22
Modified
2025-07-04
File
rules/windows/builtin/security/win_security_kerberos_asrep_roasting.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects suspicious 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 attackers request AS-REP messages for accounts without pre-authentication and attempt to crack the encrypted ticket offline to recover user passwords.

Log source

product
windows
service
security

Detection

selection:
    EventID: 4768
    TicketEncryptionType: '0x17'
    ServiceName: 'krbtgt'
    PreAuthType: 0
condition: selection

False positives (as the rule lists them)

  • Legacy systems or applications that legitimately use RC4 encryption
  • Misconfigured accounts with pre-authentication disabled

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/security/win_security_kerberos_asrep_roasting.yml

Sources and licences

  • SigmaHQ

    "Potential AS-REP Roasting via Kerberos TGT Requests" by ANosir (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/security/win_security_kerberos_asrep_roasting.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Potential AS-REP Roasting via Kerberos TGT Requests",
entity page, dataset version ref-5042bd47ae06, updated 2025-07-04T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/3e2f1b2c-4d5e-11ee-be56-0242ac120002 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 3e2f1b2c-4d5e-11ee-be56-0242ac120002, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.