Returning to Normal Operations

5. Recovery

Recovery involves restoring affected systems and services to normal, safe operation.

• Rebuilding: Systems are often wiped and rebuilt from known good backups or golden images (to ensure no lingering backdoors).
• Verification: Thorough testing to ensure that all services are functioning correctly and, critically, that the attacker has not regained access.
• Monitoring: Placing enhanced monitoring on restored systems.

6. Lessons Learned

The final phase is documentation and organizational improvement.

• Post-Incident Review: Documenting what happened, how IR responded, and where weaknesses existed.
• Metrics: Measuring IR effectiveness (time to detect, time to contain).
• Improvement: Updating security policies, strengthening training, and budgeting for new defensive controls identified as missing.