How to create an incident response plan

When cyberattacks happen, the decisions you make and the actions you take determine whether your organisation suffers a contained incident or a full-blown breach. An incident response plan outlines key steps for your team to follow, reducing downtime, costs, and long-term damage.

If you are reading this because you have experienced a ransomware incident and are unsure how to deal with it, contact Zensec immediately. Our rapid cyber incident response teams are available 24/7 to contain infected systems, protect your critical assets, and start the recovery process.

In this guide, we’ll explore how incident response plans work and outline key processes to leverage when creating one.

What is an incident response plan?

An incident response plan is a written set of steps for detecting, responding to, and recovering from security incidents. It tells people what to do, in what order, and who is responsible. It covers identifying threats, containing impact, removing the attacker, and restoring normal operations.

A good plan starts with scope and roles, mapping common scenarios like ransomware, data theft, insider misuse, denial of service, and malware outbreaks.

It also sets out playbooks with step-by-step actions for each case. Teams that lack a formal plan often take much longer to contain breaches, which leads to higher costs and more damage.

Why you need a cyber incident response plan

Incidents are not hypothetical. They are routine. The question is how prepared you are when one happens.

Aside from potentially damaging your internal operations and reputation, data breaches and other cyber incidents can lead to compliance issues. For example, the GDPR requires companies to have appropriate measures for detecting and responding to incidents.

A plan reduces panic because people can follow a set incident response process without guesswork. That clarity improves decisions and outcomes.

If you are dealing with an active incident, get expert help immediately. Early action can limit damage and speed up recovery.

Define scope and objectives

When creating an incident response plan template, the first step is to be explicit about what the plan covers, including:

• Listing the incident types in scope.
• Naming the systems, data, and business processes it protects.
• Prioritising critical processes like payment systems, customer data, and production environments.
• Setting measurable objectives.
• Preparing to meet regulatory duties.
• Setting processes to preserve evidence for insurance and legal needs.

Remember: Clear goals guide choices when time is tight.

Run a risk assessment

Start by listing your critical assets: servers, databases, apps, networks, endpoints, and the data they hold. Classify that data by sensitivity and regulation: personal data, financial data, IP, operational data.

Look at threats that match your reality, including sector, size, geography, and history. For example, a hospital faces different risks than a fintech company, while small firms see different patterns than global enterprises.

Next, you’ll need to score the potential impact, including estimating:

• Financial losses
• Disruption length
• Regulatory exposure
• Reputational harm

Use this information to decide which scenarios need the most detailed playbooks and the fastest response paths.

Build the cyber incident response team

Your incident response team should have a combination of skills, including security, IT operations, communications, HR, legal, and leadership.

Choose an incident response manager who can coordinate, decide fast, and stay calm. Technical responders – including forensic specialists, analysts, and admins – handle investigation, containment, and remediation.

You should also know when to call for outside help, with many organisations choosing to keep a retainer with an incident response firm. These firms can provide specialist support for your incident response team members, so it’s important to have a relationship before you need it.

Create a contact directory with primary and backup people for every role. Add alternate channels in case your main systems are affected, then review and update this list each quarter.

The cyber incident response lifecycle:

Preparing for security incidents

Do the groundwork before anything happens, including adding controls such as monitoring, logging, intrusion detection, and a central place to see alerts. Each of these controls provides leverage and visibility.

The next step is to write playbooks for your incident response plan. A ransomware playbook might cover isolating hosts, preserving evidence, disabling accounts, and restoring from known-good backups. Keep them short, clear, and easy to follow.

Train your team regularly to prepare for future incidents. Tabletop exercises let people walk through scenarios, test assumptions, and spot gaps.

Identifying cyber threats

Decide what counts as an incident and what does not. Not every alert deserves a full response. Define triggers that activate the plan.

Use a simple severity model so everyone speaks the same language:

• Critical: active encryption, confirmed data theft, or compromise that needs immediate action.
• High: suspected breach with likely exposure, malware on multiple systems, or attacks on critical systems.
• Medium: isolated malware or suspicious activity with limited scope.
• Low: failed attempts or events with no operational impact.

During initial assessment, capture the basics: what happened, when it was found, which systems and data are affected, and whether it is ongoing.

Containment attacks and data breaches

The containment phase stops a cyber attack from spreading and preserves vital evidence. Short-term actions might include isolating hosts, blocking traffic, disabling accounts, or shutting down specific services.

Long-term containment uses temporary fixes that let you operate while you prepare for full remediation, such as standing up clean systems or adding extra access controls.

Preserve evidence throughout. Take system images, collect logs, snapshot volatile data, and record every action you take.

Eradication

Remove the threat completely and fix what enabled it. Start with root cause analysis. How did the attacker get in? What tools did they use? Which controls failed?

Eliminate malware, backdoors, rogue accounts, and persistence. Rebuild compromised systems from clean images or backups rather than trying to “clean” them in place.

Close the holes. Patch the exploited software. Rotate or harden credentials. Tighten access.

Disaster recovery

An effective incident response plan should also include disaster recovery, including bringing systems back in a controlled way, verifying that eradication succeeded, scanning for remnants, reviewing logs, and watching the network.

Execute your disaster recovery plan in phases, including prioritising critical functions first, testing each system before you return it to production, and confirming application behaviour, data integrity, and security controls.

Plan your communications

Communication is vital when a cybersecurity incident occurs, because it keeps people aligned and reduces confusion. Define how information flows inside the response team and up to leadership.

Set up secure fallback channels in case your primary tools are affected. Personal phones, external messaging, or another out-of-band method can help.

Know your external obligations. Under GDPR, for example, you must notify the regulator within 72 hours when you become aware of a personal data breach, and you must inform affected individuals without undue delay if there is a high risk to their rights and freedoms.

Prepare templates in advance. Have holding statements, customer notices, and regulator report outlines ready to fill with specifics.

Document the plan

Your plan should include easy-to-follow incident response steps. Open with an executive summary, then cover the team, procedures, communications, and references.

Storing the plan in multiple formats, including printed and digital copies, is good practice because nobody wants to hunt for information during an incident.

Include the essentials: contacts, system diagrams, network maps, critical asset inventories, and vendor support details.

Test and validate the incident response plan

Testing turns a document into a working system. Use tabletop exercises to rehearse decisions and find blind spots. Run technical drills to practice isolating hosts, collecting evidence, and restoring from backups. When you can, run full simulations to test coordination under pressure.

Test at least once a year. Test again after big changes such as a new platform, a major reorg, or key staff turnover.

Maintain and improve your incident response plan

Incident management plans require frequent testing and optimisation. Threats change – as do your environment. Set a quarterly review to refresh contacts, add lessons from recent events, and adjust to new risks and tools.

Track a few simple metrics: time to detect, time to contain, time to recover, and recurrence. Trends will show you where to invest.

Stay current by following trusted sources, joining information-sharing groups, and keeping close ties with vendors and response partners.

Contact Zensec for support

An incident response plan lets you plan for post-incident activity and ensure business continuity. From protecting sensitive data to limiting affected systems and ensuring normal business operations can continue, the right plan reduces the chances of organisational-wide damage.

If you’d like specialist support from a security team at your disposal, please contact Zensec today.