Uninstall Sysinternals Sysmon — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: high. Source dates: 2022-01-12 / 2024-03-13.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 79b351fe0722d2e00a5cb881bc658b902380d309bdd9335db226e58263f74171

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: Uninstall Sysinternals Sysmon
id: 6a5f68d1-c4b5-46b9-94ee-5324892ea939
status: test
description: Detects the removal of Sysmon, which could be a potential attempt at defense evasion
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.001/T1562.001.md#atomic-test-11---uninstall-sysmon
author: frack113
date: 2022-01-12
modified: 2024-03-13
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    category: process_creation
    product: windows
detection:
    selection_pe:
        - Image|endswith:
              - \Sysmon64.exe
              - \Sysmon.exe
        - Description: 'System activity monitor'
    selection_cli:
        CommandLine|contains|windash: '-u'
    condition: all of selection_*
falsepositives:
    - Legitimate administrators might use this command to remove Sysmon for debugging purposes
level: high

Original YAML and metadata in JSON

False positives

• Legitimate administrators might use this command to remove Sysmon for debugging purposes

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.001/T1562.001.md#atomic-test-11---uninstall-sysmon