Information Security Incident Management Planning and Preparation
Plain English Translation
ISO 27001 Annex A.5.24 requires organizations to establish a plan for handling security incidents before they occur. This means you cannot wait for a breach to happen to decide who is in charge or what steps to take. You must formally define the incident management process, assign specific roles (like an Incident Commander), and create procedures (playbooks) so the team is prepared to respond effectively.
Technical Implementation
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Required Actions (startup)
- Create a simple Incident Response Policy defining who to call (Point of Contact)
- Set up a dedicated communication channel (e.g., #security-incidents) for reporting
Required Actions (scaleup)
- Develop specific playbooks for high-probability scenarios (e.g., Phishing, Lost Laptop)
- Formalize the Incident Response Team (IRT) with primary and backup members
Required Actions (enterprise)
- Integrate response planning with Business Continuity plans
- Conduct quarterly tabletop exercises (simulation drills) to test and refine playbooks
It is an organizational control that mandates planning and preparation for security incidents, requiring defined processes, roles, and responsibilities to be established before an incident occurs.
Create a plan that defines the incident lifecycle (Preparation, Detection, Analysis, Containment, Eradication, Recovery, Post-Incident), assigns roles, and establishes escalation paths and communication protocols.
Key roles include the Incident Manager (leads the response), Technical Leads (investigate/remediate), Communications Lead (internal/external messaging), and Legal Counsel (regulatory advice).
Auditors look for an approved Incident Response Plan, evidence of role assignments, contact lists, specific playbooks, and records of tabletop exercises demonstrating readiness. WatchDog Security's Compliance Center can map these artifacts to A.5.24, track review cadence, and assemble audit-ready evidence without changing the underlying response process.
Playbooks should include trigger conditions, initial triage steps, containment strategies (e.g., isolate host), investigation commands, and recovery verification steps specific to the threat.
Define levels (e.g., Low, Medium, High, Critical) based on impact to confidentiality, integrity, or availability, and map each level to specific escalation timelines (e.g., Critical alerts the CEO immediately).
The plan must designate a single voice for updates to prevent rumors, define secure out-of-band communication channels, and outline pre-approved templates for customer or regulatory notifications.
While ISO 27001 requires planned intervals, best practice is to conduct tabletop exercises at least annually or whenever there are significant changes to the organization or threat landscape. WatchDog Security's Compliance Center can schedule exercises as recurring evidence tasks and store outcomes, attendees, and lessons learned for consistent proof of testing.
Incident response focuses on immediate containment and mitigation, while BCDR (A.5.29) focuses on maintaining operations; the IRP should trigger the BCP if the incident causes a significant outage.
A.5.24 covers the preparation (planning, roles, playbooks), whereas A.5.25 covers the execution phase of assessing an event to decide if it qualifies as an incident.
Incident response plans often fail in audits because the “official” version is unclear, approvals are missing, or staff can’t reliably find the latest IRP and playbooks during a crisis. WatchDog Security's Policy Management can version-control the IRP and related procedures, capture approvals and review dates, and track staff acknowledgement so planning and preparation stay current.
Preparation improves when likely incident scenarios are tied to business impact, owners, and response priorities, rather than being a generic checklist. WatchDog Security's Risk Register can document top incident risks (e.g., ransomware, credential theft), map them to response playbooks and severity criteria, and track treatment actions like tabletop exercises and communication plan updates.
| Version | Date | Author | Description |
|---|---|---|---|
| 1.0.0 | 2026-02-17 | WatchDog Security GRC Team | Initial publication |
