Event ID 809 – A security event source has attempted to unregister
Whenever a security event source unregisters, event ID 809 is logged by Windows. This typically follows an earlier log of event 808, which marks the registering og the security event source.
This log data provides the following information:
- Primary User Name
- Primary Domain
- Primary Logon ID
- Client User Name
- Client Domain
- Client Logon ID
- Source Name
- Process ID
- Event Source ID
Why does event ID 809 need to be monitored?
- To ensure the event was triggered by the SYSTEM account
- To ensure restricted processes are not reported in this event
- To ensure only authorized security event sources register themselves
- To detect anomalies and malicious activities
ADAudit Plus helps you avoid the GPOs monitoring complexities with real-time pre-configured reports and auditing of the changes along with alerts within a Domain & OU. The advanced Group Policy settings real-time audit reports highlight the elusive change details, and also provide the old and new values of the modified attributes.
Event 809 applies to the following operating systems:
- Windows Server 2000
- Windows 2003 and XP
Corresponding event ID in Windows 2008 and Windows Vista is 4905