Sigma Rule Library

Mimikatz Use

This method detects mimikatz keywords in different Eventlogs (some of them only appear in older Mimikatz version that are however still used by different threat groups)

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Detection logic

keywords

- dpapi::masterkey
- eo.oe.kiwi
- event::clear
- event::drop
- gentilkiwi.com
- kerberos::golden
- kerberos::ptc
- kerberos::ptt
- kerberos::tgt
- Kiwi Legit Printer
- "lsadump::"
- mimidrv.sys
- \mimilib.dll
- misc::printnightmare
- misc::shadowcopies
- misc::skeleton
- privilege::backup
- privilege::debug
- privilege::driver
- "sekurlsa::"

filter

EventID: 15

Condition

keywords and not filter

Raw YAML

title: Mimikatz Use
id: 06d71506-7beb-4f22-8888-e2e5e2ca7fd8
status: test
description: This method detects mimikatz keywords in different Eventlogs (some of them only appear in older Mimikatz version that are however still used by different threat groups)
references:
    - https://tools.thehacker.recipes/mimikatz/modules
author: Florian Roth (Nextron Systems), David ANDRE (additional keywords)
date: 2017-01-10
modified: 2022-01-05
tags:
    - attack.s0002
    - attack.lateral-movement
    - attack.credential-access
    - car.2013-07-001
    - car.2019-04-004
    - attack.t1003.002
    - attack.t1003.004
    - attack.t1003.001
    - attack.t1003.006
logsource:
    product: windows
detection:
    keywords:
        - 'dpapi::masterkey'
        - 'eo.oe.kiwi'
        - 'event::clear'
        - 'event::drop'
        - 'gentilkiwi.com'
        - 'kerberos::golden'
        - 'kerberos::ptc'
        - 'kerberos::ptt'
        - 'kerberos::tgt'
        - 'Kiwi Legit Printer'
        - 'lsadump::'
        - 'mimidrv.sys'
        - '\mimilib.dll'
        - 'misc::printnightmare'
        - 'misc::shadowcopies'
        - 'misc::skeleton'
        - 'privilege::backup'
        - 'privilege::debug'
        - 'privilege::driver'
        - 'sekurlsa::'
    filter:
        EventID: 15  # Sysmon's FileStream Events (could cause false positives when Sigma rules get copied on/to a system)
    condition: keywords and not filter
falsepositives:
    - Naughty administrators
    - AV Signature updates
    - Files with Mimikatz in their filename
level: high

False positives

  • Naughty administrators
  • AV Signature updates
  • Files with Mimikatz in their filename

References

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