Overview

This section documents my work and practice related to defensive security, with a focus on detecting, analyzing, responding to, and mitigating security threats in operational environments.

The defensive activities presented here aim to improve visibility, response effectiveness, and resilience against real-world attacks. Rather than focusing solely on individual alerts or tools, the emphasis is placed on understanding attacker behavior, validating detections, and strengthening security controls through continuous improvement.

Scope of this section

The content in this section covers defensive security practices across multiple areas, including:

• Security Operations Center (SOC) activities, such as alert triage, investigation, and escalation

• Incident response, focusing on analysis, containment, and recovery

• Threat hunting, using hypotheses-driven approaches to identify suspicious or malicious activity

• Detection validation, ensuring that security controls effectively detect known attack techniques

• Security hardening and improvement, based on observed gaps and lessons learned

All scenarios are based on controlled environments, simulated incidents, or anonymized situations.

Methodology and approach

Defensive security work documented here follows a structured and repeatable process:

• Continuous monitoring and signal validation

• Contextual analysis of alerts and events

• Correlation of telemetry across multiple sources

• Identification of root cause and attacker objectives

• Documentation of findings and improvement opportunities

This approach prioritizes signal over noise, focusing on meaningful detections and actionable outcomes rather than alert volume.

Relationship with offensive security

Defensive security in this documentation is closely connected to offensive practices. Offensive techniques are used as reference points to:

• Validate detection coverage

• Identify blind spots in monitoring

• Improve alert logic and response playbooks

• Strengthen security posture against realistic attack paths

This alignment supports a Purple Team approach, where defensive capabilities are continuously tested and refined using offensive insights.

Notes

The material presented in this section is intended for educational and professional purposes only. No production environments are affected, and no sensitive information is disclosed.