Uninstall Crowdstrike Falcon Sensor

Hunt Hypothesis

Adversaries may disable security tools to avoid possible detection of their tools and activities by uninstalling Crowdstrike Falcon

Detection Rule

Sigma (Original)

title: Uninstall Crowdstrike Falcon Sensor
id: f0f7be61-9cf5-43be-9836-99d6ef448a18
status: test
description: Adversaries may disable security tools to avoid possible detection of their tools and activities by uninstalling Crowdstrike Falcon
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.001/T1562.001.md
author: frack113
date: 2021-07-12
modified: 2023-03-09
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains|all:
            - '\WindowsSensor.exe'
            - ' /uninstall'
            - ' /quiet'
    condition: selection
falsepositives:
    - Administrator might leverage the same command line for debugging or other purposes. However this action must be always investigated
level: high

KQL (Azure Sentinel)

imProcessCreate
| where TargetProcessCommandLine contains "\\WindowsSensor.exe" and TargetProcessCommandLine contains " /uninstall" and TargetProcessCommandLine contains " /quiet"

Required Data Sources

False Positive Guidance

• Scenario: Scheduled task to uninstall Crowdstrike Falcon Sensor during routine maintenance.
  Filter/Exclusion: Check if the process

MITRE ATT&CK Context

• Technique: T1685 — T1685

References

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.001/T1562.001.md
• SigmaHQ Rule