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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →A useful ransomware incident response checklist tells people who is in charge, what to do in sequence, how to communicate safely, what evidence to preserve, and how to restore services without reintroducing malware. Build it around your organization’s approved incident response plan and operational priorities, then exercise it before an incident. CISA’s #StopRansomware Guide, revised October 19, 2023, is the ransomware-specific foundation; NIST SP 800-61 Rev. 3, published in April 2025, provides broader incident-response context.
What should be ready before a ransomware incident?
Write the checklist into, or align it with, the organization’s approved incident response plan (IRP) and communications plan. Set an incident lead and alternates, clarify decision authority, and ensure responders can reach the plan even if corporate identity systems, email, or file shares are unavailable.
- Assign roles: name the incident lead, technical decision-makers, executive contact, communications or public information lead, and legal/privacy contact. Include the cyber insurer, managed security provider, and incident response provider where applicable.
- Keep reachable contact details: maintain current internal and external contacts somewhere available outside the affected network and identity environment. Include relevant agency contacts for the organization’s location and sector.
- Set communication and approval paths: specify who can authorize isolation, shutdown, public statements, recovery priorities, and external notifications. Identify an out-of-band channel, such as phone calls, for response coordination.
- Prepare recovery priorities: document critical services, their dependencies, the people who can authorize restoration, and the order in which systems should return.
- Make backups usable: test that backups are available, intact, and restorable; document access controls and the procedure for restoring them. Offline or immutable separation can help, but does not replace testing, correct configuration, and sufficient recovery capacity.
- Exercise the plans: CISA recommends creating, maintaining, and regularly exercising a basic IRP and associated communications plan that includes ransomware and data-extortion or breach response. Review the plan through the chain of command and update it when contacts, systems, or responsibilities change.
Keep the checklist adaptable to the organization’s size, technology, safety and mission needs, and applicable legal or regulatory obligations. It is an operational aid, not a substitute for incident-specific technical, legal, or regulatory advice.
What should we do first when ransomware is suspected?
Activate the approved plan and work through its response sequence. CISA’s guide calls for moving through the initial response steps in sequence; do not skip analysis and coordination in favor of an improvised shutdown or restoration. Record the time, observations, decisions, and decision-makers as the response proceeds.
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- Activate the response: contact the incident lead and designated responders using the plan’s approved channel. If email or collaboration systems may be monitored or compromised, switch to the established out-of-band channel.
- Confirm and scope: assess the available indicators, identify systems that appear affected, and determine what critical services or data may be at risk. Avoid treating an unverified scope as complete.
- Coordinate containment: have the authorized technical lead direct isolation actions. Use out-of-band communications for coordination because an attacker may be monitoring organizational activity or communications.
- Track the situation: maintain a timeline of findings and actions, note unresolved questions, and give leadership updates as facts develop.
How do we contain ransomware without making recovery harder?
Containment aims to limit spread while preserving the information needed to understand and remediate the incident. Coordinate actions across the affected environment rather than allowing teams to make disconnected changes.
- Isolate impacted hosts or networks: disconnect affected systems from wired and wireless networks where feasible, following the response lead’s direction. If multiple systems or subnets appear affected, CISA says taking the network offline at the switch level may be appropriate.
- Use shutdown only as a considered fallback: if affected hosts cannot otherwise be disconnected, powering them down may limit spread. It can also destroy volatile-memory evidence, so weigh that loss against the immediate risk and document the decision.
- Capture cloud state: for affected cloud resources, take volume snapshots for later forensic review where feasible, coordinating with the cloud provider and incident responders as appropriate.
- Avoid alerting the attacker unnecessarily: use the designated out-of-band channel for response coordination when organizational systems or communications may be monitored.
- Preserve relevant evidence: when immediate mitigation is not possible, CISA advises collecting system images and memory captures from a sample of affected devices, relevant logs, precursor malware samples, and indicators of compromise. Preserve volatile or short-retention evidence, such as memory and firewall log buffers, where feasible.
Evidence collection should be coordinated with qualified responders and applicable legal processes. Do not delay urgent actions needed to protect people or limit ongoing harm solely to collect evidence.
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Who should be notified, and when?
Use the notification roles and decision paths in the communications plan. Keep management and senior leaders informed as facts change, and coordinate public statements through the designated communications or public information personnel. Share verified information, label uncertainty, and record what was communicated and to whom.
- Internal stakeholders: notify the teams and leaders named in the plan, including service owners who need to prepare for outages or recovery work.
- External partners: contact the cyber insurer, managed security or incident response provider, and other contractual or operational partners according to the plan and applicable agreements.
- Government reporting or assistance: CISA lists CISA, the local FBI field office, the FBI Internet Crime Complaint Center (IC3), and the local U.S. Secret Service field office as possible channels. These are U.S. channels; determine which are appropriate for the incident and organization.
- People whose data may be affected: if personal or other regulated data was exposed, involve legal and privacy personnel and follow the requirements applicable to the organization, data, and jurisdiction. CISA’s guide does not establish a single notification deadline for every organization or jurisdiction.
How should we eradicate the threat and preserve evidence?
After containment, responders need to identify and remove the causes and persistence mechanisms before affected systems are trusted again. Coordinate technical remediation with the incident lead and qualified responders; keep a record of what was found, changed, and validated.
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- Preserve relevant system images, memory captures, logs, malware samples, and indicators of compromise when feasible, especially evidence that may disappear quickly.
- Determine the affected scope and address compromised accounts, devices, and access paths before reconnecting systems. Base eradication decisions on the investigation rather than assuming that a ransom note identifies the full extent of compromise.
- Consult federal law enforcement about possible decryptors where appropriate. Do not assume a decryptor exists for a particular ransomware variant or promise that files can be recovered through one.
- Coordinate any external statements or evidence sharing with the responsible legal, communications, and incident-response personnel.
How do we recover after ransomware?
Restore from offline, encrypted backups in an order tied to safety, mission, and business dependencies. A successful backup job is not proof that a clean, usable restoration is possible; use tested procedures and validate systems before reconnecting them.
- Confirm the recovery environment is trustworthy: prepare clean systems and access paths. Do not add compromised devices to recovery environments.
- Choose restoration order: use documented service priorities and dependencies to decide what to recover first. Consider operational and safety consequences, not only which system is easiest to restore.
- Restore from suitable backups: use offline, encrypted backups that responders have confirmed are available and suitable for recovery. Follow access controls and the organization’s established restoration procedures.
- Validate before reconnecting: check restored systems for integrity and signs of compromise, and confirm that required services work as expected before returning them to production or connecting them to other systems.
- Monitor and document: track restoration progress, unresolved risks, and service status; keep leadership and affected service owners informed through the communications plan.
What belongs in the after-action review?
Once immediate response and restoration demands allow, document what happened, the decisions made, and what worked or needs correction. Use the findings to update the IRP, communications plan, contacts, recovery priorities, and technical safeguards; then exercise the revised plans again. Consider sharing relevant indicators and lessons with CISA or the organization’s sector information sharing and analysis center (ISAC), as appropriate.
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