HackTool - Mimikatz Kirbi File Creation — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems), David ANDRE. Source status: test; severity: critical. Source dates: 2021-11-08 / 2024-06-27.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 0f6eeec794001fa74bb294acfe2130656d138de6806ae1faa5f63d4078aa999f

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: HackTool - Mimikatz Kirbi File Creation
id: 9e099d99-44c2-42b6-a6d8-54c3545cab29
related:
    - id: 034affe8-6170-11ec-844f-0f78aa0c4d66
      type: obsolete
status: test
description: Detects the creation of files created by mimikatz such as ".kirbi", "mimilsa.log", etc.
references:
    - https://cobalt.io/blog/kerberoast-attack-techniques
    - https://pentestlab.blog/2019/10/21/persistence-security-support-provider/
author: Florian Roth (Nextron Systems), David ANDRE
date: 2021-11-08
modified: 2024-06-27
tags:
    - attack.credential-access
    - attack.t1558
logsource:
    category: file_event
    product: windows
detection:
    selection:
        TargetFilename|endswith:
            - '.kirbi' # Kerberos tickets
            - 'mimilsa.log' # MemSSP default file
    condition: selection
falsepositives:
    - Unlikely
level: critical

Original YAML and metadata in JSON

False positives

• Unlikely

Source references

• https://cobalt.io/blog/kerberoast-attack-techniques
• https://pentestlab.blog/2019/10/21/persistence-security-support-provider/