A telecom ransomware response plan must do more than isolate infected computers: it needs to protect people and critical services while giving responders authority to contain the attack, preserve evidence, communicate safely, and restore the network in a controlled order. Build the plan around your actual topology, service dependencies, third-party access, and jurisdiction-specific obligations, then exercise it before an incident.
1. Establish command, authority, and scope
Put names, decision rights, backups, and contact methods in the plan—not just a list of departments. CISA’s joint #StopRansomware Guide, revised in September 2023, recommends maintaining and regularly exercising an incident response plan and associated communications plan that cover ransomware and data-extortion or breach procedures. Its guidance is a starting point; the operator must adapt it to its network, services, and legal obligations.
Name an incident commander and define decision rights
Designate an incident commander with authority to convene the response and resolve cross-team priorities. Name deputies for coverage, and specify who can approve containment, service changes, external notifications, and restoration. These decisions may have different owners; for example, security can recommend isolating a segment, while network engineering and service operations assess the resulting service and safety effects.
| Role | Plan responsibility |
|---|---|
| Incident commander | Coordinates the response, maintains the decision record, and escalates decisions that exceed delegated authority. |
| Security and incident response | Scopes affected systems and identities, directs investigation, and advises on containment and eradication. |
| Network engineering and service operations | Assess topology, dependencies, service impact, and technically feasible isolation and restoration actions. |
| Legal, privacy, and regulatory owners | Determine applicable reporting, notification, evidence-handling, and other legal obligations for the operator and incident. |
| Executive leadership and communications | Make escalated business decisions and coordinate approved internal, customer, partner, and public communications. |
| Vendors and external responders | Provide defined support under pre-agreed access, escalation, evidence, and communications arrangements. |
Set the scope and escalation path
Define which network, IT, cloud, operational, and customer-facing environments the plan covers; what constitutes an incident requiring activation; and who can declare or end an incident. Keep a 24/7 contact roster with alternates and an escalation path. Include relevant managed or security providers, cyber insurers, and public-information personnel where appropriate. Make clear which external parties may be contacted by whom, and under what authority.
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2. Map the network and services that must be protected
A response team cannot make safe isolation or recovery choices from an incomplete asset list. Maintain current diagrams and inventories that let responders trace from a suspected compromised component to the services and dependencies it may affect. CISA’s December 4, 2024 communications-infrastructure visibility and hardening guidance is aimed at network engineers and defenders; its telecom focus makes it a useful complement to general ransomware guidance.
Document topology, access, and service dependencies
- Record network segments, IP schemes, interconnections, data flows, and the systems supporting critical services.
- Map cloud services and third-party or managed-service access, including the identities and remote access paths those parties use.
- For each critical service, identify supporting systems and dependencies needed to operate it and restore it, rather than listing only the service’s visible components.
- Keep the diagrams, inventories, and essential response procedures secured, with offline copies or hard copies available if normal systems are unavailable or untrusted.
Pre-plan isolation choices with service owners
For each important segment or dependency, document who assesses the operational impact of disconnection, who authorizes it, and what alternatives responders can consider. A broad network-level isolation may be necessary if several systems or subnets appear affected, but the decision must account for the operator’s architecture and service obligations. The CISA materials do not establish a universal carrier cutover sequence; network engineering and service owners must work out safe, architecture-specific options in advance.
3. Prepare communications that do not depend on compromised systems
Assume that email, chat, collaboration tools, or identity systems may be unavailable or monitored. Establish out-of-band contact methods—such as a maintained phone roster—and test that decision-makers can reach one another without relying on the affected environment.
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Agree on communication roles and rules
- Identify who can approve internal updates and customer, partner, regulator, or public statements.
- Prepare holding statements and a process for updating them as verified facts change; avoid publishing unconfirmed scope, cause, or recovery estimates.
- Decide what operational detail can be shared, with whom, and through which channel.
- Use out-of-band channels for response coordination when compromise of normal communications is plausible, so response actions are less likely to be exposed prematurely.
4. Detect, scope, and contain the incident
After a suspected ransomware attack, activate the approved plan, establish incident command, and determine what is affected before making changes that could erase evidence or cause avoidable service disruption. Scope hosts, network segments, cloud resources, identities, and service dependencies. Keep the containment decision tied to observed risk and pre-agreed operational authority.
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- Activate and coordinate. Notify the incident commander through the designated channel, open an incident record, and move coordination out of potentially compromised systems when warranted.
- Establish scope. Collect available alerts and reports; identify suspected affected hosts, subnets, cloud resources, identities, and connected services. Record what is known, what remains uncertain, and the basis for each decision.
- Assess service and safety effects. Have network engineering and service owners evaluate which isolation options are feasible and what critical services or dependencies they could affect.
- Isolate affected systems. Disconnect affected systems from the network where possible. If evidence indicates multiple systems or subnets are involved, consider network-level isolation under the plan’s authority and impact-assessment process.
- Preserve evidence while containing. When feasible, capture volatile evidence before taking an action that would destroy it. CISA advises avoiding device power-down when network disconnection is possible, because powering down can destroy volatile evidence. Preserve relevant cloud snapshots where available.
- Track decisions and changes. Record isolation actions, approvals, time, affected components, and known service effects so the investigation and restoration teams can work from a shared account.
There is no single containment choice that fits every carrier. A segment-specific isolation can limit collateral effects, while broader isolation may be needed when the compromise spans multiple systems or subnets. The plan should make the decision process executable without pretending the safe option can be known in advance for every topology.
5. Preserve evidence and investigate how access occurred
Preserve material that can establish the scope, entry path, attacker activity, persistence, and impact. Coordinate collection with containment and service operations so that evidence collection does not inadvertently expose additional systems or delay a necessary protective action.
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Collect and correlate the available records
- System images and memory captures where feasible.
- Network and host logs, endpoint detection data, and firewall records.
- Cloud records and relevant cloud snapshots.
- Suspected command-and-control indicators and malware samples, handled through the organization’s evidence procedures.
- Records of response actions and the times they occurred.
Use centralized log management where available and correlate network, host, and cloud records to reconstruct activity across systems. CISA recommends retaining logs for critical systems for a minimum of one year if possible. That is agency guidance, not a blanket legal requirement; the operator’s retention schedule and applicable obligations may differ.
Look beyond the encrypted system
Investigate how the attacker gained access and whether access persists in accounts or services beyond the visibly affected devices. Review relevant remote access, VPN, single sign-on, and public-facing services, along with existing detection and prevention tools, for earlier-stage compromise and persistence. Use the results to scope eradication and decide what must be verified before restoration.
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6. Report and coordinate through a jurisdiction-specific matrix
Reporting duties depend on the operator’s jurisdiction, services, and incident facts. Create a legal and regulatory matrix before an incident, with the responsible owner, trigger, required information, approved channel, and applicable deadline for each obligation. Have legal and regulatory teams maintain it as requirements change. Do not rely on a generic ransomware guide as a substitute for that operator-specific analysis.
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List internal and external contacts in advance
Include executives, legal and privacy teams, communications staff, managed or security providers, insurers, and relevant authorities in the contact and notification process. CISA’s U.S.-oriented guide identifies CISA, local FBI field offices, FBI IC3, and the U.S. Secret Service as possible U.S. reporting or assistance channels. Which channels are appropriate depends on the circumstances; operators outside the United States need their own jurisdiction-specific contacts.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.7. Eradicate and restore services safely
Do not treat successful decryption or restoration of one system as proof that the environment is clean. Confirm the affected scope, remove attacker access, and restore systems in a clean environment with the dependencies needed for critical services accounted for.
Use a controlled recovery process
- Define the recovery scope. Use the investigation to identify affected systems, accounts, access paths, and services that need recovery or validation.
- Remove compromised access. Address affected accounts and access routes, including remote access, VPN, SSO, and public-facing services where relevant.
- Prepare a clean recovery environment. Restore from offline, encrypted backups on a clean network, rather than reconnecting unverified systems to production.
- Order recovery by service need and dependency. Prioritize essential services while restoring the supporting systems and dependencies they require. Set the order with service owners and network engineering.
- Verify before reconnection. Check restored systems and the relevant access paths for signs of compromise before reconnecting them to other environments or returning them to service.
- Record the return to service. Document verification, approval, and any unresolved risk or operating constraint for each restored service or system.
Recovery priorities must reflect the operator’s service commitments and architecture. The guidance does not prescribe a universal service-by-service restoration order or a carrier cutover runbook; those belong in the operator’s own plan.
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8. Exercise the plan and improve it
Run exercises that test whether people can use the plan under realistic constraints, not just whether a document exists. CISA recommends regularly exercising incident response and communications plans and points to no-cost exercise resources.
Test decisions, not only detection
- Can the incident commander reach deputies and critical decision-makers if email or chat is untrusted?
- Can network engineering identify the affected segment’s dependencies and explain the likely service effect of isolation?
- Can the team preserve useful evidence while containing a spreading incident?
- Can legal and regulatory owners locate the correct jurisdiction-specific obligations and contacts?
- Can service owners agree on restoration priorities and verify systems before reconnection?
- Can external providers and internal communications staff follow their assigned roles without disclosing response actions through compromised channels?
After each exercise or real incident, record gaps, assign owners and due dates, update diagrams and contacts, and revise procedures that proved unclear. Re-exercise material changes to network architecture, access arrangements, or service dependencies.
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