The first hour of a security incident is critical. How your organisation responds can mean the difference between a minor incident and a catastrophic breach.
The Golden Hour
In incident response, the first 60 minutes are crucial for:
- Containing the incident
- Preventing further damage
- Preserving evidence
- Initiating communication protocols
Minutes 0-15: Detection and Initial Assessment
Confirm the Incident
Verify that a genuine security incident has occurred. Eliminate false positives quickly.
Activate the Incident Response Team
Immediately notify all key stakeholders according to your incident response plan.
Begin Documentation
Start detailed logging of all actions taken. This documentation will be crucial for post-incident analysis and potential legal proceedings.
Minutes 15-30: Containment
Isolate Affected Systems
Disconnect compromised systems from the network to prevent lateral movement.
Preserve Evidence
Take system snapshots and memory dumps before making any changes.
Assess Scope
Determine which systems, data, and users are affected.
Minutes 30-45: Analysis and Communication
Analyse Attack Vectors
Identify how the attacker gained access and what vulnerabilities were exploited.
Notify Stakeholders
Inform senior management, legal counsel, and potentially affected parties as required.
Engage External Resources
If needed, bring in external incident response specialists or law enforcement.
Minutes 45-60: Eradication Planning
Develop Remediation Plan
Create a detailed plan for removing the threat and restoring normal operations.
Implement Quick Wins
Apply immediate security measures such as password resets or blocking malicious IPs.
Prepare Communication
Draft internal and external communications as appropriate.
Critical Do's and Don'ts
Do:
- Follow your documented incident response plan
- Document everything
- Preserve evidence
- Communicate clearly and calmly
Don't:
- Panic or make rash decisions
- Turn off systems without preserving evidence
- Negotiate with attackers without legal counsel
- Hide the incident from senior management
Post-Incident Activities
After the immediate crisis is contained, conduct thorough post-incident analysis to learn and improve your security posture.
Conclusion
Effective incident response requires preparation, practice, and clear procedures. Regular tabletop exercises ensure your team is ready when seconds count.
