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performing-linux-log-forensics-investigation

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Perform forensic investigation of Linux system logs including syslog, auth.log, systemd journal (via journalctl), kern.log, auditd, and application logs to reconstruct user sessions, identify unauthorized access and privilege escalation, trace lateral movement, and establish event timelines. Use when investigating a suspected compromise of a Linux system and needing to analyze SSH, sudo, cron, or kernel-level activity from plain-text or systemd journal logs.

skills/performing-linux-log-forensics-investigation/SKILL.md

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# Performing Linux Log Forensics Investigation

## Overview

Linux systems maintain extensive logs that serve as primary evidence sources in forensic investigations. Unlike Windows Event Logs, Linux logs are typically plain-text files stored in /var/log/ and binary journal files managed by systemd-journald. Key forensic logs include auth.log (authentication events, sudo usage, SSH sessions), syslog (system-wide messages), kern.log (kernel events), and application-specific logs. The Linux Audit framework (auditd) provides detailed security event logging comparable to Windows Security Event Logs. Forensic analysis of these logs enables investigators to reconstruct user sessions, identify unauthorized access, detect privilege escalation, trace lateral movement, and establish comprehensive event timelines.


## When to Use

- When conducting security assessments that involve performing linux log forensics investigation
- When following incident response procedures for related security events
- When performing scheduled security testing or auditing activities
- When validating security controls through hands-on testing
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