In our last blog post we explained what an Incident Response Plan (IRP) and a Disaster Recovery Plan (DRP) are, and the importance of having both in your business to effectively respond to technical disasters.
In this post we’re going to look at IRP’s specifically in detail, and how to create one for your business. We will be following Microsoft recommendations as well as the NIST framework.
An Incident Response Plan is a structured approach to managing the aftermath of a cybersecurity incident. It is a living strategy with key goals: contain, mitigate, recover, and learn.
Having an IRP ensures that you can effectively respond to a cyber incident. Without a plan in place, you risk fumbling around, scrambling to respond to the threat, and time is crucial. A well-defined IRP ensures that every team member understands their role, enabling an immediate and coordinated response rather than confusion and delays.
Now then, let’s get into it….
Let’s break it down, there are 6 core phases which make up an Incident Response Plan.
Preparation truly is the foundation of any good IRP. Understanding your environment and the risks associated is key in being able to plan an effective response.
So here is what you need to do:
Define roles and responsibilities: Ensuring every team member knows their part, from technical response to legal and communications.
Asset and system mapping: Maintain an up-to-date inventory of critical systems and data to prioritise during an incident.
Establishing communication plans: Define clear internal and external communication protocols, including who speaks to customers, regulators, and the media.
Training and awareness: Regularly train your team on security hygiene and incident protocols, this builds confidence and readiness.
Without thorough preparation, your response efforts will be chaotic and slow, increasing the potential impact of an incident.
The sooner you identify a threat, the sooner you can contain it.
Here’s what you should consider:
Monitoring and detection: Utilise tools like SIEM systems, endpoint detection, and user reports to spot unusual activity. An example of a SIEM system is Microsoft Sentinel.
Classifying incidents: Not every alert is an incident. You need to develop criteria for what constitutes an incident and what level of severity it falls under so that you are only alerted to true incidents.
Notification procedures: Establish who needs to be informed once an incident is detected and ensure this process is swift.
You don’t want an attack to fly under the radar.
Now that you can effectively identify threats, let’s look at how to contain them to prevent wide-spread damage:
Short-term containment: Quickly isolate affected systems to stop lateral movement across your network.
Long-term containment: Implement temporary fixes or reroute operations while maintaining essential functions.
Communication control: Ensure accurate, controlled communication during containment to avoid panic and misinformation.
Containment buys you time to fully analyse and respond to the threat.
Once the threat is contained, it’s time to remove it completely from your environment.
This step includes:
Root cause analysis: Identify exactly how the incident occurred to ensure you remove the underlying cause, not just the symptoms.
Removing malware or unauthorised access: Clean up the affected systems, revoke any compromised credentials, and patch identified vulnerabilities.
Validating the environment: Ensure systems are clean before bringing them fully back into operation.
Thorough eradication greatly reduces the risk of reinfection or further compromise.
After eradication, your focus will be on restoring systems and returning to normal operations safely.
This should involve:
System restoration: Recover data and services using verified backups.
Monitoring for anomalies: Keep a close watch for signs of lingering threats during the recovery phase.
Gradual reintroduction: Bring systems back online in phases, prioritising the most critical functions first.
Recovery is your opportunity to strengthen your environment before resuming full operations.
Nearly there! Don’t underestimate the importance of post-incident reflection.
After resolving the incident you should:
Conduct a post-incident review: Gather your team to discuss what happened, what went well, and what could be improved.
Update your IRP: Integrate lessons learned to strengthen your plan and address identified gaps.
Share insights: Communicate relevant findings with your wider team to improve organisational resilience.
Reflection transforms each incident into an opportunity to strengthen your defences for the future.
Once your IRP is in place, it’s essential to test it end-to-end with all relevant stakeholders. A plan is only as effective as its execution, and without regular testing, even the best strategies can falter in the heat of a real incident. Initial testing should involve walking through the entire IRP process with every team member involved as this helps identify any gaps, misunderstandings, or logistical challenges before a real crisis hits.
To keep your team sharp, schedule regular testing sessions, ideally on a quarterly or biannual basis depending on the size and risk profile of your organisation. One of the most effective methods for testing is a tabletop exercise: a simulated scenario where team members are asked to role-play their responses to a cyber incident.
Over time, these simulations help build muscle memory across departments, ensuring that your response is swift, coordinated, and effective when real threats emerge. You’ll rest easy knowing that your team is ready to battle any threat.
An Incident Response Plan isn’t just a document, it’s your business’ safety net when a cyber incident strikes.
By preparing thoroughly, following clear steps, and learning from each incident, you build a culture of resilience that will protect your operations, your team, and your customers.
Don’t wait for a crisis to test your readiness, invest in your IRP now, so your business can respond with confidence and recover faster when it matters most.
In our next blog post, we’ll walk you through exactly how to build a DRP for your business step by step.
Important Links:
Read our last blog post on why you need both an IRP and a DRP here: https://a4scloud.solutions/irp-vs-drp-both-to-survive-a-cyber-attack/
You can find more information about Microsoft Defender XDR here:https://www.microsoft.com/en-gb/security/business/siem-and-xdr/microsoft-defender-xdr
Read about Incident Response from Microsoft here: https://www.microsoft.com/en-gb/security/business/security-101/what-is-incident-response
Read our blog post on Device Code Phishing attacks here: https://a4scloud.solutions/device-code-phishing-attacks-detect-and-prevent/
Read our latest LinkedIn post here: https://www.linkedin.com/feed/update/urn:li:activity:7330902690350133248
Go to our Buy page for information about licensing: https://a4scloud.solutions/hardware-software-cloudassets/