Suspicious Kerberos Ticket Request via PowerShell Script - ScriptBlock

 1title: Suspicious Kerberos Ticket Request via PowerShell Script - ScriptBlock
 2id: a861d835-af37-4930-bcd6-5b178bfb54df
 3related:
 4    - id: caa9a802-8bd8-4b9e-a5cd-4d6221670219
 5      type: similar
 6status: test
 7description: |
 8    Detects PowerShell scripts that utilize native PowerShell Identity modules to request Kerberos tickets.
 9    This behavior is typically seen during a Kerberoasting or silver ticket attack. A TGS request is issued by
10    the KerberosRequestorSecurityToken constructor, resulting tickets are cached in LSA and become
11    extractable by other tools later on.    
12references:
13    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1558.003/T1558.003.md#atomic-test-4---request-a-single-ticket-via-powershell
14    - https://learn.microsoft.com/en-us/dotnet/api/system.identitymodel.tokens.kerberosrequestorsecuritytoken?view=netframework-4.8.1
15author: frack113
16date: 2021-12-28
17modified: 2026-09-14
18tags:
19    - attack.credential-access
20    - attack.t1558.003
21logsource:
22    product: windows
23    category: ps_script
24    definition: 'Requirements: Script Block Logging must be enabled'
25detection:
26    selection:
27        ScriptBlockText|contains: 'System.IdentityModel.Tokens.KerberosRequestorSecurityToken'
28    condition: selection
29falsepositives:
30    - Legitimate Kerberos authentication development and troubleshooting scripts
31level: high
32regression_tests_path: regression_data/rules/windows/powershell/powershell_script/posh_ps_request_kerberos_ticket/info.yml