Individual skill

configuring-host-based-intrusion-detection

Configures host-based intrusion detection systems (HIDS) to monitor endpoint file integrity, system calls, and configuration changes for security violations. Use when deploying OSSEC, Wazuh, or AIDE for endpoint monitoring, building file integrity monitoring (FIM) policies, or meeting compliance requirements for change detection. Activates for requests involving HIDS configuration, file integrity monitoring, OSSEC/Wazuh deployment, or host-based detection.

internal/tools/skills/data/endpoint-security/configuring-host-based-intrusion-detection/SKILL.md

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Nov 7, 2026
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# Configuring Host-Based Intrusion Detection

## When to Use

Use this skill when:
- Deploying HIDS agents (Wazuh, OSSEC, AIDE) across Windows and Linux endpoints
- Configuring file integrity monitoring (FIM) for compliance (PCI DSS 11.5, NIST SI-7)
- Monitoring system configuration changes, rootkit detection, and security policy violations
- Integrating HIDS alerts with SIEM platforms for centralized monitoring

**Do not use** this skill for network-based IDS (Suricata, Snort) or for EDR deployment.

## Common Misconfigurations & Verification

- **FIM "realtime" silently downgraded to scheduled:** `realtime="yes"` only works with inotify (Linux) or the USN journal (Windows). On NFS/overlay mounts it falls back to the 12h `<frequency>` scan — touch a file under a watched `/etc` path and confirm a 550/554 alert fires within seconds, not hours. For change-who attribution use `whodata="yes"` (requires auditd).