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Contain the attack before trying to recover files. Isolate affected computers, servers, shares, cloud volumes and accounts; move coordination off potentially monitored email or chat; preserve evidence; and bring in your incident lead, counsel, insurer and qualified responders. Do not wipe systems or reconnect restored machines until you know how the intrusion occurred and have verified a clean recovery path.
Ransomware can involve both encryption and theft. Treat the event as a security breach until investigation shows otherwise, report it through the appropriate channels, and restore only from backups or images you can verify as clean.
What to do in the first minutes
Activate the incident plan and assign one lead
Declare an incident under your approved response plan and name one person to coordinate technical, legal, insurance, executive and communications decisions. A single incident lead prevents contradictory instructions such as reconnecting a server while responders are still collecting evidence. Start a written timeline immediately: record who noticed the encryption, which actions were taken, by whom, and at what time.
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List affected endpoints, servers, virtual machines, file shares, databases, cloud volumes, backup systems, VPN connections, remote-access tools and user accounts. Ask users to report symptoms without opening suspicious attachments or running cleanup tools. Look for common encrypted-file extensions, ransom notes, unusual administrator accounts, disabled security software and unexpected logins. Scope can change as you investigate, so keep the inventory time-stamped.
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Isolate systems at several control points
CISA’s #StopRansomware Guide (September 2023) states: “Determine which systems were impacted, and immediately isolate them.” Use the fastest control that limits lateral movement:
- Disable affected switch ports or place infected segments in a quarantine VLAN.
- Disconnect Ethernet and remove Wi-Fi from individual devices where practical.
- Disable VPN, remote desktop, remote-management tools and other external access paths that may be compromised.
- Restrict east-west traffic between servers, workstations, identity systems and backup networks.
- Quarantine cloud workloads, storage shares and synchronization accounts; suspend automated replication if it could carry encrypted files to clean copies.
- Block known malicious domains, addresses and file hashes at firewalls, DNS, email and endpoint controls without deleting the underlying evidence.
If a device cannot be disconnected, power it down only as a last resort. Shutting down can destroy volatile memory and active network information that investigators may need. Record the reason and time if emergency power-off is unavoidable.
Move coordination to an out-of-band channel
Assume attackers may monitor internal email, collaboration platforms or shared documents. Use prearranged phone numbers, a clean messaging service, or another channel that does not depend on the compromised identity system. Tell staff not to negotiate with attackers, publicize details, or restore systems independently.
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Preserve evidence before cleaning anything
Evidence supports eradication, insurance claims, regulatory decisions and law-enforcement investigations. Preserve material in a controlled location and restrict access to the response team. Capture or export, where feasible:
- Ransom notes, contact addresses, cryptocurrency instructions and payment deadlines.
- Samples of encrypted files, original file extensions, timestamps and affected directories.
- Disk images and memory captures from representative systems before reimaging.
- Endpoint, identity, VPN, firewall, DNS, cloud, backup and application logs covering the suspected intrusion period.
- Suspicious executables, scripts, scheduled tasks, registry changes, persistence mechanisms and malware hashes.
- Lists of compromised accounts, administrator activity, remote sessions and data-transfer destinations.
- User reports, screenshots, alerts and a chronological record of every containment and recovery action.
Do not delete ransom notes, rename encrypted files, run a generic consumer recovery utility, or wipe machines before collecting evidence. Preserve originals as read-only where possible and work from copies. A digital-forensics or incident-response specialist can help acquire images and memory safely when your team lacks the tools or expertise.
Report the attack and bring in the right advisers
Notify your executive owner, IT and security staff, managed security provider, cyber insurer, outside counsel and communications lead according to your plan. Insurers often require use of approved vendors or prior authorization; calling an unapproved provider first can affect coverage. Counsel can coordinate privileged investigation and determine which notices are required.
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Report the incident to the local FBI field office and the Internet Crime Complaint Center (IC3). Consider assistance from CISA and the U.S. Secret Service, especially when critical services, substantial theft or a broad compromise is involved. IC3 asks for details such as the ransomware variant if known, encrypted-file extension, cryptocurrency type and address, attacker email addresses or URLs, requested amount, and whether any payment occurred. Submit what you know and update the report as facts are confirmed.
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Encryption does not prove that files stayed inside your network. In “double extortion,” attackers copy data and then threaten to publish it, even if you can restore from backups. Investigate outbound transfers, cloud-access logs, archive creation, unusual compression, large encrypted uploads and access to sensitive repositories. Check whether identity, payroll, health, financial, customer or intellectual-property data was reachable.
Do not announce a universal breach-notification deadline: obligations vary by jurisdiction, sector, contract, data type and the people affected. Counsel should map the facts to applicable regulators, customers, employees, partners and contractual notice clauses. Coordinate public statements through the designated communications lead, and avoid claiming that data was not stolen until the investigation supports that conclusion.
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Should you pay the ransom?
The FBI’s ransomware guidance, updated August 18, 2026, says: “The FBI does not support paying a ransom in response to a ransomware attack.” CISA and the United Kingdom’s National Cyber Security Centre likewise discourage payment because it can encourage further crime, fund illicit activity and still fail to produce a working decryptor or deletion of stolen data. Payment can also make your organization a more attractive target.
A payment decision is not a technical shortcut. If leadership is considering it, involve outside counsel, the insurer, law enforcement and a qualified incident-response negotiator. Screen the recipient and transaction for sanctions and other legal restrictions; document the business-continuity impact, contractual duties, safety consequences, likely recovery time, and the possibility that attackers will demand more money. Never assume that a promise to delete copied data is verifiable. Do not transfer funds until legal and financial controls approve the transaction.
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Compare recovery paths before choosing one
Restoring backups, rebuilding from golden images, engaging specialists and considering payment solve different problems. Evaluate each against the same operational criteria:
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| Recovery path | Containment and evidence impact | Recovery-point age and speed | Reinfection and theft risk | When it fits |
|---|---|---|---|---|
| Restore known-clean backups | Preserves the investigation if performed on a segmented recovery network | Depends on the last verified backup; restoration time varies by data volume and infrastructure | Low only when backups and credentials are clean and the original access path is closed | Preferred when reliable, offline or otherwise protected backups exist |
| Rebuild from golden images | Creates a clean baseline but still requires evidence collection from affected hosts first | Usually loses local changes after the image date; speed depends on automation and inventory | Lower than in-place cleanup when credentials and persistence are reset | Useful for compromised operating systems or uncertain integrity |
| Incident-response and forensic specialists | Improves evidence quality and threat hunting; adds cost and coordination | Can shorten decisions when internal expertise is limited | Reduces blind spots but cannot guarantee recovery | Appropriate for complex, widespread or legally sensitive incidents |
| Payment, only after advice | May complicate legal, evidentiary and sanctions issues; does not remove the need to investigate | No guaranteed decryptor, speed or completeness | Attackers may not decrypt or may retain and release stolen data | Discuss only after leadership, counsel, insurer and law enforcement assess alternatives |
Recover without reinfecting the network
- Choose a clean recovery point. Identify the newest backup that predates the intrusion or contains no suspicious activity. Verify that backup catalogs, snapshots, replication targets and cloud versions were not deleted or encrypted by the attacker. Check restore samples before committing to a large recovery.
- Build a separate recovery network. Use isolated switching, new administrative credentials and tightly controlled connections. Do not attach restored systems to suspected hosts, shared administrator accounts or unverified synchronization services.
- Rebuild priority infrastructure. Reimage domain controllers, identity services, hypervisors, management servers and other foundational systems from known-clean golden images. If an image’s provenance is uncertain, create a fresh build and patch it before use.
- Reset identity and access. Change privileged, service, VPN, cloud and backup credentials. Revoke active sessions, tokens, API keys and remote-management certificates that could have been stolen. Enforce multifactor authentication, especially for administrators and remote access.
- Restore critical services in business order. Rank systems by safety, legal obligations, revenue, customer impact and dependency. Restore identity and core infrastructure before applications that rely on them, and keep each restored tier segmented until monitoring shows normal behavior.
- Hunt for persistence while restoring. Examine scheduled tasks, startup items, new accounts, mailbox forwarding rules, remote tools, firewall changes and unusual authentication. Watch endpoint alerts, privilege use, east-west traffic and data egress for signs of reinfection.
- Return systems to production gradually. Require an owner to approve each connection, document the validation checks, and maintain heightened logging. If encryption resumes or suspicious traffic appears, isolate the system again and reassess the recovery point.
Backups that withstand ransomware
Ransomware commonly searches for accessible backups and attempts to delete or encrypt them. Keep multiple copies using a 3-2-1-style design or another architecture that separates failure domains: different media or systems, at least one copy offline or otherwise unreachable from ordinary administrator accounts, and protection against unauthorized deletion.
- Encrypt backup data in transit and at rest, with keys managed separately from production credentials.
- Disconnect removable backup media when it is not actively being used. Store it securely and control physical access.
- For cloud storage, evaluate immutability, object lock, versioning, delete protection, retention periods and independent credentials. Validate the settings after every configuration change and account for storage and retrieval costs.
- Test complete restorations, not just whether a backup job reports success. Measure recovery time, recovery-point age, application dependencies and the people required to perform the work.
- Keep clean golden images, configuration documentation, license information and emergency contact details outside the affected identity system.
Harden the environment after recovery
Recovery is incomplete until the entry path is closed and monitoring can detect a repeat intrusion. Apply operating-system and application patches, remove unsupported software, and inventory every asset that can reach production. Use multifactor authentication, least privilege, network segmentation and endpoint protection. Centralize logs, protect them from alteration, and alert on impossible travel, privilege escalation, mass file changes, disabled security controls and unusual outbound transfers.
Rotate credentials in a deliberate order so old secrets cannot be reused. Review service accounts, shared administrator accounts, dormant users, third-party remote access and cloud application consent. Add delete protection or object lock to suitable cloud backup repositories, and test that recovery administrators are independent from normal domain administration.
Exercise the incident-response and communications plans with leadership, IT, legal, the insurer and critical vendors. A tabletop should cover a complete loss of email, identity services and file shares, an extortion demand involving stolen data, a decision about customer notification, and restoration from offline media. Update contact lists, authority levels, recovery priorities and technical runbooks after each exercise.
Common mistakes and how to avoid them
- Reconnecting everything at once: restore in dependency order on segmented networks and require validation before each production connection.
- Wiping first: preserve images, memory, logs and notes before reimaging unless an immediate safety need requires shutdown.
- Trusting a ransom promise: treat decryption and data deletion as unverified claims; payment does not replace eradication, reporting or notification analysis.
- Using a file-recovery utility as a decryptor: generic recovery software cannot be expected to decrypt an unknown ransomware strain and may alter evidence.
- Ignoring cloud and identity systems: investigate tokens, synchronization, SaaS storage, mail rules, API keys and remote-access accounts as part of the same incident.
- Assuming one backup is enough: maintain independent, protected copies and prove that a full restoration works before an emergency.
When to escalate immediately
Bring in specialist incident response, digital forensics, breach counsel or managed detection support when encryption spans multiple sites, privileged accounts are compromised, backups are unavailable, regulated data may be involved, attackers claim to have stolen data, or your team cannot establish a trustworthy clean environment. Specialist help does not remove your leadership responsibilities, but it can improve evidence handling, threat hunting, restoration sequencing and communication under pressure.
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