Linux Auditd Auditd Daemon Start
The following analytic detects the (re)initialization of the Linux audit daemon (auditd) by identifying log entries of type DAEMON_START. This event indicates that the audit subsystem has resumed logging after being stopped or has started during system boot. While DAEMON_START may be expected during reboots or legitimate configuration changes, it can also signal attempts to re-enable audit logging after evasion, or restarts with modified or reduced rule sets. Monitoring this event in correlation with DAEMON_END, DAEMON_ABORT, and auditctl activity provides visibility into the continuity and integrity of audit logs. Frequent or unexplained DAEMON_START events should be investigated, especially if they are not accompanied by valid administrative or system activity.
Detection Logic
`linux_auditd` type=DAEMON_START
| rename host as dest
| stats count min(_time) as firstTime max(_time) as lastTime
BY type op res
auid dest pid
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `linux_auditd_auditd_daemon_start_filter`False Positives
- ⚠ Administrator or network operator can use this application for automation purposes. Please update the filter macros to remove false positives.
Field Validations
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