Sigma rule: Suspicious Kerberos Ticket Request via PowerShell Script - ScriptBlock

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-2d1325eb8271, updated 2026-09-14T00:00:00.000Z.

Rule

Title
Suspicious Kerberos Ticket Request via PowerShell Script - ScriptBlock
Status
test
Level
high
Author
frack113
Date
2021-12-28
Modified
2026-09-14
File
rules/windows/powershell/powershell_script/posh_ps_request_kerberos_ticket.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects PowerShell scripts that utilize native PowerShell Identity modules to request Kerberos tickets.
This behavior is typically seen during a Kerberoasting or silver ticket attack. A TGS request is issued by
the KerberosRequestorSecurityToken constructor, resulting tickets are cached in LSA and become
extractable by other tools later on.

Log source

product
windows
category
ps_script
definition
Requirements: Script Block Logging must be enabled

Detection

selection:
    ScriptBlockText|contains: 'System.IdentityModel.Tokens.KerberosRequestorSecurityToken'
condition: selection

False positives (as the rule lists them)

  • Legitimate Kerberos authentication development and troubleshooting scripts

Tags

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

MITRE ATT&CK ids this rule names

Related rules

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/powershell/powershell_script/posh_ps_request_kerberos_ticket.yml

Sources and licences

  • SigmaHQ

    "Suspicious Kerberos Ticket Request via PowerShell Script - ScriptBlock" by frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/powershell/powershell_script/posh_ps_request_kerberos_ticket.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 Ticket Request via PowerShell Script - ScriptBlock",
entity page, dataset version ref-2d1325eb8271, updated 2026-09-14T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/a861d835-af37-4930-bcd6-5b178bfb54df (accessed 2026-11-03).
Underlying source: SigmaHQ rule a861d835-af37-4930-bcd6-5b178bfb54df, 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.