Suspicious Kerberos Ticket Request via CLI — Sigma Rule

{
  "category": "process_creation",
  "product": "windows"
}

title: Suspicious Kerberos Ticket Request via CLI
id: caa9a802-8bd8-4b9e-a5cd-4d6221670219
related:
    - id: a861d835-af37-4930-bcd6-5b178bfb54df
      type: similar
status: experimental
description: |
    Detects suspicious Kerberos ticket requests via command line using System.IdentityModel.Tokens.KerberosRequestorSecurityToken class.
    Threat actors may use command line interfaces to request Kerberos tickets for service accounts in order to
    perform offline password cracking attacks commonly known as Kerberoasting or other Kerberos ticket abuse
    techniques like silver ticket attacks.
references:
    - https://www.huntress.com/blog/gootloader-threat-detection-woff2-obfuscation
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1558.003/T1558.003.md#atomic-test-4---request-a-single-ticket-via-powershell
    - https://learn.microsoft.com/en-us/dotnet/api/system.identitymodel.tokens.kerberosrequestorsecuritytoken?view=netframework-4.8.1
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-11-18
tags:
    - attack.credential-access
    - attack.t1558.003
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith:
              - '\powershell.exe'
              - '\pwsh.exe'
        - OriginalFileName:
              - 'powershell.exe'
              - 'pwsh.dll'
    selection_cli:
        CommandLine|contains|all:
            - 'System.IdentityModel.Tokens.KerberosRequestorSecurityToken'
            - '.GetRequest()'
    condition: all of selection_*
falsepositives:
    - Legitimate command line usage by administrators or security tools.
level: high