Building an Effective Incident Response Plan
How to create, test, and maintain an incident response plan that minimises damage and accelerates recovery from security incidents.
Why You Need an Incident Response Plan
Security incidents are not a matter of if but when. Organisations with a tested incident response plan recover faster and suffer less damage than those without one.
The Six Phases of Incident Response
1. Preparation
Build your response capability before an incident occurs:
- Assemble your incident response team
- Define roles and communication channels
- Establish relationships with external partners (legal, PR, forensics)
- Deploy monitoring and detection tools
2. Identification
Detect and confirm that an incident has occurred:
- Monitor alerts from SIEM and IDS/IPS systems
- Investigate anomalies reported by users or automated systems
- Classify the incident by type and severity
3. Containment
Limit the damage while preserving evidence:
- Short-term: Isolate affected systems immediately
- Long-term: Apply temporary fixes while preparing for eradication
4. Eradication
Remove the root cause of the incident:
- Identify and eliminate malware, unauthorised access, or vulnerabilities
- Apply patches and security updates
- Reset compromised credentials
5. Recovery
Restore systems to normal operation:
- Rebuild systems from clean backups
- Monitor closely for signs of re-compromise
- Gradually restore services with verification
6. Lessons Learned
Conduct a post-incident review:
- Document the timeline and decisions made
- Identify what worked and what needs improvement
- Update the response plan based on findings
Testing Your Plan
Tabletop exercises are the most effective way to test your incident response plan without the stress of a real incident.
Securelyn offers tabletop exercises to test and strengthen your incident response capabilities. Learn more.