Noise Letter October 2025

Summary: GreyNoise's October NoiseLetter announces Block, a blocklist approach the company describes as highly configurable, grounded in primary-sourced intelligence, and updated in real-time as attacker behavior changes. The newsletter also says GreyNoise is seeking Active Development Partners to apply Suricata Rules and network packet queries to its historical dataset.
What you should know: GreyNoise frames the case for Block around practitioner complaints that existing blocklists are too noisy, too static, too opaque, and too slow to update - the same feeds many security teams still rely on as a first line of defense.

Read the original at GreyNoise Blog ↗