HackTool - KrbRelay Execution

Description

Detects the use of KrbRelay, a Kerberos relaying tool

Query · sigma

selection_img:
- Image|endswith: \KrbRelay.exe
- OriginalFileName: KrbRelay.exe
selection_cli_1:
  CommandLine|contains|all:
  - ' -spn '
  - ' -clsid '
  - ' -rbcd '
selection_cli_2:
  CommandLine|contains|all:
  - shadowcred
  - clsid
  - spn
selection_cli_3:
  CommandLine|contains|all:
  - 'spn '
  - 'session '
  - 'clsid '
condition: 1 of selection_*

Known false positives

  • Unlikely
Raw source HackTool - KrbRelay Execution · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: HackTool - KrbRelay Execution
id: e96253b8-6b3b-4f90-9e59-3b24b99cf9b4
status: test
description: Detects the use of KrbRelay, a Kerberos relaying tool
references:
    - https://github.com/cube0x0/KrbRelay
author: Florian Roth (Nextron Systems)
date: 2022-04-27
modified: 2023-02-04
tags:
    - attack.credential-access
    - attack.t1558.003
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\KrbRelay.exe'
        - OriginalFileName: 'KrbRelay.exe' # In case the file has been renamed after compilation
    selection_cli_1:
        CommandLine|contains|all:
            - ' -spn '
            - ' -clsid '
            - ' -rbcd '
    selection_cli_2:
        CommandLine|contains|all:
            - 'shadowcred'
            - 'clsid'
            - 'spn'
    selection_cli_3:
        CommandLine|contains|all:
            - 'spn '
            - 'session '
            - 'clsid '
    condition: 1 of selection_*
falsepositives:
    - Unlikely
level: high

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