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Detection rules › Sigma

HackTool - Mimikatz Kirbi File Creation

Status
test
Severity
critical
Log source
category file_event, product windows
Author
Florian Roth (Nextron Systems), David ANDRE
Source
github.com/SigmaHQ/sigma

Detects the creation of files created by mimikatz such as ".kirbi", "mimilsa.log", etc.

Known false positives

  • Unlikely

MITRE ATT&CK coverage

TacticTechniques
Credential Access

Telemetry coverage

ProviderRecord / event type
SysmonEvent ID 11: FileCreate

Rule body

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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    TargetFilename|endswith:
        - '.kirbi'
        - 'mimilsa.log'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
TargetFilenameends_with
  • .kirbi
  • mimilsa.log
field:"TargetFilename" kind:ends_with