Sigma rule: Uninstall Sysinternals Sysmon

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-9fa49bd59049, updated 2026-06-29T00:00:00.000Z.

Rule

Title
Uninstall Sysinternals Sysmon
Status
test
Level
high
Author
frack113
Date
2022-01-12
Modified
2026-06-29
File
rules/windows/process_creation/proc_creation_win_sysinternals_sysmon_uninstall.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the removal of Sysmon, which could be a potential attempt at defense evasion

Log source

product
windows
category
process_creation

Detection

selection_pe:
    - Image|endswith:
          - \Sysmon64.exe
          - \Sysmon64a.exe
          - \Sysmon.exe
    - Description: 'System activity monitor'
selection_cli:
    CommandLine|contains|windash: '-u'
condition: all of selection_*

False positives (as the rule lists them)

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

Tags

  • attack.defense-impairment
  • attack.t1685

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_sysinternals_sysmon_uninstall.yml

Sources and licences

  • SigmaHQ

    "Uninstall Sysinternals Sysmon" by frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_sysinternals_sysmon_uninstall.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Uninstall Sysinternals Sysmon",
entity page, dataset version ref-9fa49bd59049, updated 2026-06-29T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/6a5f68d1-c4b5-46b9-94ee-5324892ea939 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 6a5f68d1-c4b5-46b9-94ee-5324892ea939, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.