The Respond function
The Respond function requires organizations to establish and execute processes to take action once a cybersecurity incident is detected. Its primary purpose is to contain the impact of an event and manage its resolution through coordinated response activities.
What it means
In practice, "Respond" moves the organization from a state of monitoring (Detect) to active management. It assumes that breaches or failures will occur and focuses on minimizing damage by ensuring the organization does not react chaotically.
The scope covers the entire lifecycle of an incident after detection: analyzing what happened, containing the threat to prevent it from spreading, mitigating the vulnerability, and communicating with necessary stakeholders. This includes both technical actions (like isolating a server) and administrative actions (like notifying legal counsel or regulators).
Effectiveness is measured by how quickly an organization can move from "alert" to "contained," and whether those actions are performed according to a pre-defined, repeatable strategy rather than ad-hoc decision-making.
How to meet it
- Develop a formal Incident Response Plan (IRP) that defines what constitutes an incident, severity levels, and the step-by-step process for handling them.
- Establish a designated Incident Response Team (IRT) with clearly defined roles, including technical leads, management, legal counsel, and communications officers.
- Create specific "playbooks" for common scenarios—such as ransomware or data leaks—to ensure consistent response actions across different threats.
- Implement technical capabilities to isolate affected systems or segments of the network quickly to prevent lateral movement by an attacker.
- Define a communication matrix that specifies who must be notified (internal executives, external regulators, customers) and the required timelines for those notifications.
- Schedule and conduct regular tabletop exercises to simulate incidents, testing the IRP and ensuring team members know their responsibilities.
Evidence an auditor asks for
- The current version of the written Incident Response Plan and any associated technical playbooks.
- Detailed incident logs or tickets from past events showing a timeline of detection, containment actions taken, and final resolution.
- Records of tabletop exercises, including attendance lists, the scenario tested, and "lessons learned" documents used to update the IRP.
- A documented contact list for internal stakeholders and external third parties (e.g., cyber insurance providers or forensics firms).
Common pitfalls
- Treating the Incident Response Plan as a static document ("shelfware") that is not updated when the network architecture or organizational structure changes.
- Failing to define clear escalation triggers, resulting in critical incidents being handled by junior staff for too long before management is notified.
- Neglecting real-time documentation during an active incident, which leaves the organization unable to provide a forensic trail or perform accurate post-incident analysis.