🚨 Building An Incident Response Plan

Learn how organizations prepare for security incidents before they occur and why preparation often determines the outcome.

🔥 The Building Fire Analogy

When a fire starts:

• People should know evacuation routes
• Emergency contacts should exist
• Responsibilities should be clear

Nobody wants to create a plan while the building is already burning.

Cybersecurity incidents are no different.

📖 What Is Incident Response?

Incident Response (IR) is the structured process of:

• Detecting incidents
• Containing impact
• Investigating events
• Recovering systems
• Improving defenses

⚙️ Incident Response Lifecycle

🛠 Phase 1: Preparation

Before incidents happen:

• Create response procedures
• Define escalation paths
• Maintain contact lists
• Prepare investigation tools
• Conduct exercises

Preparation often determines success.

🚨 Phase 2: Detection

Incidents are often discovered through:

• SIEM Alerts
• EDR Alerts
• Customer Reports
• Cloud Monitoring
• Security Teams

The faster detection occurs, the better.

🛡 Phase 3: Containment

Goals:

• Limit damage
• Prevent spread
• Protect critical assets

Examples:

• Disable accounts
• Isolate endpoints
• Restrict access

🧹 Phase 4: Eradication

After containment:

• Remove root cause
• Fix vulnerabilities
• Remove malicious artifacts
• Strengthen controls

Containment alone is not enough.

🔄 Phase 5: Recovery

Systems return to normal operation.

Examples:

• Restore services
• Validate systems
• Monitor closely
• Confirm business functionality

📚 Phase 6: Lessons Learned

Every incident provides learning opportunities.

Questions:

• What happened?
• What worked well?
• What failed?
• What should improve?

This is where organizations become stronger.

👥 Who Should Be Involved?

• Security Team
• IT Operations
• Engineering
• Management
• Legal Team
• Communications Team

Incidents rarely affect only one department.

💻 SaaS Example

Suppose a production AWS account shows suspicious activity.

Questions immediately arise:

• Who investigates?
• Who approves containment?
• Who contacts customers?
• Who communicates with leadership?

An incident response plan answers these questions in advance.

📋 IR Plan Checklist

⚠️ Common Mistake

Many companies create:

• Incident Response Documents

But never test them.

Tabletop exercises and simulations help validate plans before real incidents occur.

🏆 Key Lesson

The best time to prepare for an incident is before it happens.

Preparation Reduces Panic

🏆 How Mature Security Programs Work

Bring together everything learned in Defensive Strategies and see how successful organizations combine people, processes, and technology into an effective security program.