...The repository offers more than 3000 detection rules of different type and aims to make reliable detections accessible to all at no cost. Sigma is an open-source tool for defining generic detection rules for security event logs, enabling security professionals to detect threats across platforms.
...Zeek interprets what it sees and creates compact, high-fidelity transaction logs, file content, and fully customized output, suitable for manual review on disk or in a more analyst-friendly tool like a security and information event management (SIEM) system.
OSSIM, AlienVault’s Open Source Security Information and Event Management (SIEM) product, provides event collection, normalization and correlation. For more advanced functionality, AlienVault Unified Security Management (USM) builds on OSSIM with these additional capabilities:
* Log management
* Advanced threat detection with a continuously updated library of pre-built correlation rules
* Actionable threat intelligence updates from AlienVault Labs Security Research Team
* Rich analytics dashboards and data visualization