WHY SIEM RULES FAIL AND HOW TO FIX THEM: INSIGHTS FROM 160 MILLION ATTACK SIMULATIONS

Summary from the TLDR InfoSec newsletter

The Picus Blue Report 2025 analyzed 160 million attack simulations and found organizations detect only 1 out of 7 attacks, with 50% of failures attributed to log collection issues, including source coalescing, unavailable log sources, and network disruptions. Additional failure causes include rule misconfigurations (13%) and performance bottlenecks (24%) from resource-heavy rules and inefficient queries that overwhelm systems. Organizations must implement continuous validation through breach and attack simulation to test rules against evolving TTPs, optimize log collection pipelines, and tune detection thresholds to close critical security gaps.