Host intrusion detection systems (HIDS) are essential for catching threats that slip past network defenses. OSSEC and Wazuh are two leading open-source options, with Wazuh offering a modernized fork with centralized management and compliance features. This guide examines key deployment considerations: agent installation, log collection, and rule customization. Writing effective rules requires understanding the attack surface and tuning false positives. OSSEC's rule syntax is powerful but has a learning curve, while Wazuh provides a more accessible dashboard. For organizations seeking cost-effective security monitoring, these tools offer a robust alternative to commercial EDR. The post highlights practical patterns for rule writing, such as detecting unusual login patterns or file integrity changes. As threats evolve, HIDS remains a foundational layer in defense-in-depth strategies.
Explore open-source host intrusion detection with OSSEC and Wazuh, focusing on deployment and rule writing for effective threat monitoring.