Potential Disabling of AppArmor

Last updated 20 days ago on 2026-01-18
Created 2 years ago on 2023-08-28

About

This rule monitors for potential attempts to disable AppArmor. AppArmor is a Linux security module that enforces fine-grained access control policies to restrict the actions and resources that specific applications and processes can access. Adversaries may disable security tools to avoid possible detection of their tools and activities.
Tags
Domain: EndpointOS: LinuxUse Case: Threat DetectionTactic: Defense EvasionData Source: Elastic DefendData Source: Elastic EndgameData Source: Auditd ManagerData Source: CrowdstrikeData Source: SentinelOneLanguage: eql
Severity
high
Risk Score
73
MITRE ATT&CK™

Defense Evasion (TA0005)(external, opens in a new tab or window)

License
Elastic License v2(external, opens in a new tab or window)

Definition

Rule Type
Event Correlation Rule
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
auditbeat-*endgame-*logs-auditd_manager.auditd-*logs-crowdstrike.fdr*logs-endpoint.events.process*logs-sentinel_one_cloud_funnel.*
Related Integrations

endpoint(external, opens in a new tab or window)

auditd_manager(external, opens in a new tab or window)

crowdstrike(external, opens in a new tab or window)

sentinel_one_cloud_funnel(external, opens in a new tab or window)

Query
text code block:
process where host.os.type == "linux" and event.type == "start" and event.action in ("exec", "exec_event", "start", "ProcessRollup2", "executed", "process_started") and ( (process.name == "systemctl" and process.args in ("disable", "stop", "kill", "mask") and process.args in ("apparmor", "apparmor.service")) or (process.name == "service" and process.args == "apparmor" and process.args == "stop") or (process.name == "chkconfig" and process.args == "apparmor" and process.args == "off") or (process.name == "update-rc.d" and process.args == "apparmor" and process.args in ("remove", "disable")) or (process.name == "ln" and process.args : "/etc/apparmor.d/*" and process.args == "/etc/apparmor.d/disable/") ) and not ?process.parent.executable == "/opt/puppetlabs/puppet/bin/ruby"

Install detection rules in Elastic Security

Detect Potential Disabling of AppArmor in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).