System Recovery and Validation

Recovery is where your organisation transitions from crisis mode back to normal operations — but rushing this phase creates the risk of restoring compromised systems or reintroducing the vulnerability that caused the incident. Controlled, validated recovery is essential.

Recovery Process

1. Prioritise systems: Restore business-critical systems first, based on your business continuity plan. Finance, customer-facing services, and communication systems typically take priority.
2. Restore from clean sources: Use known-good backups or freshly built images. Never restore from backups taken during the compromise period without thorough validation.
3. Validate before reconnecting: Before bringing a restored system back onto the production network, verify that it is clean, patched, and properly hardened.
4. Monitor intensively: After recovery, increase monitoring on restored systems for at least 30 days. Attackers frequently test whether their access still works.

Validation Checklist

• Operating system and applications are patched to current levels.
• The vulnerability or misconfiguration exploited in the attack has been remediated.
• All credentials have been rotated.
• Security tools (EDR, logging) are installed and reporting correctly.
• Network access is limited to what is required (principle of least privilege).

Action Steps

• Confirm that your backup strategy supports recovery from a cyber incident (not just hardware failure).
• Test backup restoration for your top three critical systems — verify that you can actually restore them.
• Create a recovery validation checklist and include it in your IR plan.