Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management.
It has been downloaded over 2 million times and is being used by security teams worldwide.
Security Onion 2.4 comes with many updates, and the hotfix 2.4.10 release is available on GitHub.
For network visibility, they offer signature-based detection via Suricata, rich protocol metadata and file extraction using Zeek or Suricata, full packet capture via Stenographer, and file analysis via Strelka.
For host visibility, Security Onion offers the Elastic Agent, which provides data collection, live queries via osquery, and centralized management using Elastic Fleet.
All these logs flow into Elasticsearch, and they’ve built their own UIs for alerts, dashboards, threat hunting, case management, and grid management.