What Is Recovery in Incident Response?

Definition

Recovery is the stage of incident response where you bring systems and data back to normal operation after the attacker has been removed, then confirm they work and stay clean. It can mean restoring from backups, rebuilding servers, or replacing equipment. Recovery is finished when the business runs normally and monitoring shows no sign of the attacker returning.

How It Works

NIST SP 800-61 Revision 2 lists the usual recovery actions: restore systems from clean backups, rebuild systems from scratch, replace compromised files with clean versions, install patches, change passwords, and tighten perimeter security such as firewall rules. It recommends higher levels of logging and monitoring afterward, because "once a resource is successfully attacked, it is often attacked again."

A practical sequence for a small business:

1. Decide the order. CISA's #StopRansomware Guide says to restore based on a predefined list of critical systems: whatever keeps revenue, safety, or customer service running comes first.
2. Use backups you can trust. Restore from offline backups taken before the compromise. CISA recommends offline, encrypted backups precisely because attackers try to destroy reachable ones.
3. Do not reinfect. CISA advises rebuilding on a clean network segment and adding only systems known to be clean.
4. Test before trusting. NIST says administrators should confirm that restored systems are functioning normally before the business relies on them again.
5. Phase it. For large incidents NIST says recovery can take months: quick, high-value fixes first, longer-term infrastructure changes later.

Two planning numbers set expectations in advance: your recovery time objective (RTO), how long you can be down, and your recovery point objective (RPO), how much data you can afford to lose.

Real-World Example

On February 21, 2024, a criminal group calling itself ALPHV or BlackCat deployed ransomware inside Change Healthcare, a company that moves claims and payments between doctors, pharmacies, and health plans. In Senate Finance Committee testimony on May 1, 2024, UnitedHealth Group CEO Andrew Witty said the attackers had used compromised credentials on a Citrix remote access portal that did not have multi-factor authentication, nine days before the ransomware launched. Recovery meant rebuilding Change Healthcare's technology "from the ground up": the team replaced thousands of laptops, rotated credentials, rebuilt the data center network and core services, and added new server capacity, delivering a new environment in weeks. Witty described the downstream effect on small providers, from pharmacists submitting claims by hand to "the rural family medicine practice struggling to make payroll."

Why It Matters for a Small Business

Recovery is where downtime turns into lost revenue, and where a small business finds out whether its backups were really offline, complete, and tested. It also decides whether paying a ransom is even on the table. In Verizon's 2026 DBIR, 69% of ransomware victims in the dataset did not pay. Recovery can depend on other companies, too: the same report found a third party involved in 55% of breaches at small and medium-sized businesses, and the Change Healthcare case shows how a vendor's outage becomes your cash-flow problem.

How to Spot It / How DTS Handles It

You are ready to recover when eradication is complete, the entry point is closed, and you know which backup predates the compromise. Warning signs of a rushed recovery: restoring the newest backup without checking its date, reconnecting systems before passwords are reset, or turning monitoring off once things "look normal."

DTS restores to a clean staging environment first, scans and verifies it, then cuts over in priority order, requests a Search Console review if the site was flagged, and stays extra vigilant over the following week or weeks. DTS typically sets up a tripwire, either file integrity or behavior monitoring, that sends a push alert if anything tries to re-emerge. Start with our incident response service.

Related Terms

• Eradication: recovery only works on an environment that is already clean.
• Backups and the 3-2-1 rule: the copies recovery depends on.
• Recovery time objective (RTO): how long the business can be down.
• Recovery point objective (RPO): how much data the business can afford to lose.
• Ransomware: the incident that most often forces a full recovery.
• Post-incident review: turning the recovery into lessons for next time.

Sources

• NIST, SP 800-61 Rev. 2, Computer Security Incident Handling Guide (Section 3.3.4, Eradication and Recovery; withdrawn April 3, 2025 and superseded by Rev. 3): https://csrc.nist.gov/pubs/sp/800/61/r2/final
• CISA and MS-ISAC, #StopRansomware Guide (Part 1 backups; Part 2 Recovery and Post Incident Activity): https://www.cisa.gov/stopransomware/ransomware-guide
• Testimony of Andrew Witty, UnitedHealth Group, Senate Finance Committee (May 1, 2024): https://www.finance.senate.gov/imo/media/doc/0501_witty_testimony.pdf
• Verizon, 2026 Data Breach Investigations Report (key findings; SMB focused analysis): https://www.verizon.com/business/resources/Tf3/reports/2026-dbir-data-breach-investigations-report.pdf

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Last updated October 14, 2026.