Host-Based Security & Auditing

Host-Based Security & Auditing

Learn host-based security and auditing on Linux by focusing on the evidence an attacker leaves behind on the system itself. Network traffic can show that something happened, but host artifacts explain what changed, who accessed it, and how the compromise unfolded. This course teaches you how to use file integrity monitoring, auditd, and system log analysis to detect tampering, investigate suspicious activity, and harden Linux hosts.

Why It Matters

Attackers rarely leave a system untouched. They modify files, authenticate to services, escalate privileges, and interact with sensitive directories. If you can monitor those actions at the host level, you can catch activity that never appears clearly in network-only tooling.

This course is designed for defenders who need practical Linux visibility. You will build a baseline for trusted files, configure low-level auditing rules, parse operational logs, and use those signals together in a realistic hardening and investigation workflow.

What You Will Learn

• Create and verify file integrity baselines to detect unauthorized changes.
• Configure auditd rules to monitor sensitive files, commands, and directories.
• Parse Linux authentication and system logs for brute-force attempts and privilege abuse.
• Correlate integrity, audit, and log data into a single host investigation.
• Apply multiple host controls in a realistic security hardening scenario.

Course Roadmap

• File Integrity Monitoring (FIM): Use AIDE to build a trusted baseline and identify unauthorized file modifications.
• System Auditing with Auditd: Configure kernel-backed audit rules to track sensitive operations with high precision.
• System Log Analysis: Review auth.log and syslog to identify failed logins, sudo abuse, and suspicious access patterns.
• Host Security Hardening: Combine integrity monitoring and auditing to investigate and contain a simulated insider-style threat.

Who This Course Is For

• SOC analysts and defenders who need stronger host-level investigation skills.
• Linux administrators who want practical auditing and hardening techniques.
• Learners moving from packet analysis into endpoint and server security.

Outcomes

By the end of this course, you will be able to monitor critical Linux hosts for tampering, investigate suspicious access, and build stronger auditing coverage for real operational environments.