Sigma rule: Suspicious Kerberos RC4 Ticket Encryption

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-d064967104e0, updated 2022-06-19T00:00:00.000Z.

Rule

Title
Suspicious Kerberos RC4 Ticket Encryption
Status
test
Level
medium
Author
Florian Roth (Nextron Systems)
Date
2017-02-06
Modified
2022-06-19
File
rules/windows/builtin/security/win_security_susp_rc4_kerberos.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects service ticket requests using RC4 encryption type

Log source

product
windows
service
security

Detection

selection:
    EventID: 4769
    TicketOptions: '0x40810000'
    TicketEncryptionType: '0x17'
reduction:
    ServiceName|endswith: '$'
condition: selection and not reduction

False positives (as the rule lists them)

  • Service accounts used on legacy systems (e.g. NetApp)
  • Windows Domains with DFL 2003 and legacy systems

Tags

  • attack.credential-access
  • attack.t1558.003

MITRE ATT&CK ids this rule names

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_susp_rc4_kerberos.yml

Sources and licences

  • SigmaHQ

    "Suspicious Kerberos RC4 Ticket Encryption" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/security/win_security_susp_rc4_kerberos.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: Suspicious Kerberos RC4 Ticket Encryption",
entity page, dataset version ref-d064967104e0, updated 2022-06-19T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/496a0e47-0a33-4dca-b009-9e6ca3591f39 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 496a0e47-0a33-4dca-b009-9e6ca3591f39, 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.