Sysmon Driver Unloaded Via Fltmc.EXE — Sigma Rule

Rule metadata and linked tags

Author: Kirill Kiryanov, oscd.community. Source status: test; severity: high. Source dates: 2019-10-23 / 2023-02-13.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 7886d74d9883898b45473e0ab1f655b0510faab52656f50af0000550d66a9048

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: Sysmon Driver Unloaded Via Fltmc.EXE
id: 4d7cda18-1b12-4e52-b45c-d28653210df8
related:
    - id: 4931188c-178e-4ee7-a348-39e8a7a56821 # Generic
      type: similar
status: test
description: Detects possible Sysmon filter driver unloaded via fltmc.exe
references:
    - https://www.darkoperator.com/blog/2018/10/5/operating-offensively-against-sysmon
author: Kirill Kiryanov, oscd.community
date: 2019-10-23
modified: 2023-02-13
tags:
    - attack.stealth
    - attack.defense-impairment
    - attack.t1070
    - attack.t1685
    - attack.t1685.001
logsource:
    product: windows
    category: process_creation
detection:
    selection_img:
        - Image|endswith: '\fltMC.exe'
        - OriginalFileName: 'fltMC.exe'
    selection_cli:
        CommandLine|contains|all:
            - 'unload'
            - 'sysmon'
    condition: all of selection_*
falsepositives:
    - Unlikely
level: high

Original YAML and metadata in JSON

False positives

• Unlikely

Source references

• https://www.darkoperator.com/blog/2018/10/5/operating-offensively-against-sysmon