Windows Event Log Architecture: Why Your SIEM Is Probably Missing 30% of Events and How to Verify It
ยท 31 min read
An analyst flags a suspicious lateral movement alert. You pull the investigation timeline. There is a 47-minute gap in process creation events from a critical server right across the window where the attacker moved. The EDR shows nothing. The SIEM shows nothing. Post-incident forensics on the local machine reveals 6,800 events that never left the endpoint. The Security event log overwrote itself. The WEF subscription had a filter bug. The WEC server was under load. Nobody noticed because nobody measured. This scenario is not hypothetical it is the most common root cause of detection gaps found during post-incident reviews, and it is almost entirely preventable.