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OSSEC / HIDS Rule 593
- Rule family: OSSEC / HIDS
- Rule ID: 593
- Definition status: Present in current source
- Alert message / subject: Microsoft Event log cleared.
- Rule level: 9
- Definition checked: 2026-10-21
Interpretation and response
The Microsoft Event log was cleared. Investigate authorized maintenance and possible loss of audit evidence.
An OSSEC/HIDS event records or correlates activity. Blocking depends on the originating application and any separately configured Active Response policy; an alert alone does not prove that an attack was blocked.
The archived description referred to ossec.log; the current definition reports a cleared Microsoft Event log.
Documentation
The following guidance was migrated from the historical wiki and reviewed against the rule definition. Legacy ASL product names and interface instructions refer to the versions documented then. Use the current metadata above and your installed configuration when interpreting thresholds, notification settings and response behavior.
Description
The Microsoft Event log was cleared. Investigate authorized maintenance and possible loss of audit evidence.
What you should do
Review the event and expected administrative activity. The earlier instructions under this heading applied to the historical description; use the current interpretation above.
Troubleshooting
False Positives
Review the event and expected administrative activity. The earlier instructions under this heading applied to the historical description; use the current interpretation above.
Tuning Guidance
Review the event and expected administrative activity. The earlier instructions under this heading applied to the historical description; use the current interpretation above.
Additional Information
Support
If you are unsure about how to respond to this alert, please contact Atomicorp support. We’re here to help you!
Source and revision
Migrated from HIDS_593, wiki page 756, revision 6116 (20201021). Documentation review: 2026-10-21. An archived wiki status of Active is not a current deployment status.
For assistance, provide the rule ID, installed product and rule version, and a sanitized event to Atomicorp support .