This topic will cover the fundamentals of incident response, including defining incidents, understanding the importance of a robust incident response plan, and the key goals and objectives of incident response.
Introduction to Incident Response
Prepared as a quick‑reference guide for students, new analysts, or anyone needing a concise overview.
| Aspect | Description |
|---|---|
| Definition | A coordinated set of actions taken to detect, analyze, contain, eradicate, and recover from a security event or breach. |
| Goal | Minimize impact on business operations, protect data integrity, and restore normal service as quickly as possible. |
| Scope | Can cover anything from malware infections and phishing attacks to insider threats and ransomware. |
| Phase | Primary Activities | Key Deliverables |
|---|---|---|
| 1. Preparation | • Develop IR policies & playbooks • Build and train the response team • Deploy detection tools (SIEM, IDS/IPS, EDR) • Establish communication & escalation paths |
• IR plan • Asset inventory • Contact lists (internal, legal, PR, law enforcement) |
| 2. Identification | • Monitor alerts and logs • Correlate events to spot anomalies • Verify whether an event is a true incident |
• Incident ticket • Initial classification (e.g., malware, data breach) |
| 3. Containment | • Short‑term: isolate affected systems (network segmentation, account lockout) • Long‑term: apply temporary controls to prevent spread while preserving evidence |
• Containment checklist • Evidence preservation log |
| 4. Eradication | • Remove malicious artifacts (malware, backdoors) • Patch vulnerable software • Reset compromised credentials |
• Clean‑up report • Updated system baselines |
| 5. Recovery | • Restore systems from clean backups • Validate functionality and security • Monitor for re‑infection |
• Recovery validation checklist • Post‑recovery monitoring plan |
| 6. Lessons Learned | • Conduct a post‑mortem (often called a “debrief”) • Identify gaps in detection, containment, or processes • Update policies, playbooks, and training |
• After‑action report (AAR) • Revised IR documentation |
| Role | Responsibilities |
|---|---|
| Incident Response Manager | Oversees the whole process, coordinates with leadership, ensures timelines are met. |
| Security Analyst / SOC Engineer | Detects alerts, performs triage, gathers forensic data. |
| Forensic Investigator | Acquires and analyzes evidence (disk images, memory dumps, network traffic). |
| Malware Analyst | Disassembles suspicious code, determines behavior, creates detection signatures. |
| IT Operations / System Admin | Executes containment, eradication, and recovery tasks on affected assets. |
| Legal / Compliance Officer | Advises on regulatory obligations, evidence handling, and potential notification requirements. |
| Communications / PR | Prepares internal/external statements, handles media inquiries. |
| Management / Executive Sponsor | Provides resources, approves budget, makes high‑level decisions (e.g., public disclosure). |
| Term | Meaning |
|---|---|
| Indicator of Compromise (IOC) | Artefacts that suggest a breach (e.g., malicious IP, hash, domain). |
| Tactics, Techniques, and Procedures (TTPs) | Attackers’ |