Incident Response
Definition
Incident Response is the structured, repeatable set of activities an organization uses to prepare for, detect, analyze, contain, eradicate, recover from, and learn from information security incidents. In ISO/IEC 27001:2022-aligned programs, incident response is a core operational capability that supports the effectiveness of the ISMS by ensuring security events are assessed consistently and escalated when they meet the organization’s incident criteria. It typically includes defined roles and authorities, communication and escalation paths, incident classification and severity levels, evidence preservation, decision-making for containment and remediation, and documented lessons learned to prevent recurrence. In other security and compliance programs, this is often referred to as security incident management and is commonly aligned with guidance such as ISO/IEC 27035 and NIST SP 800-61. Effective incident response coordinates technical teams with governance functions such as risk management, legal, privacy, and business continuity to meet contractual obligations and applicable regulatory expectations without tying the process to any single jurisdiction. It also emphasizes keeping reliable records (timelines, actions taken, approvals, and artifacts) so that outcomes are auditable, improvements are measurable, and the organization can demonstrate disciplined handling of security incidents over time.
Real-World Examples
Startup API key exposure
A SaaS startup detects a leaked API key, revokes credentials, rotates secrets, reviews logs for misuse, and documents lessons learned.
Ransomware containment and recovery
A scaleup isolates infected endpoints, blocks lateral movement, restores critical systems from backups, preserves evidence, and runs a post-incident review.
Enterprise insider data exfiltration
An enterprise investigates abnormal downloads, preserves forensic artifacts, limits access, coordinates with HR and legal, and updates controls to reduce recurrence.
Incident response is the coordinated process used to manage security incidents from detection through recovery, including containment, remediation, communication, and documented lessons learned.
Common phases include preparation, detection and analysis, containment, eradication, recovery, and post-incident activities such as reporting and improving controls.
Create a plan by defining incident criteria, roles, escalation paths, communication procedures, evidence handling, playbooks for common scenarios, and review/testing cadence.
It should include scope, definitions, severity levels, responsibilities, decision authority, notification workflows, forensic and evidence steps, and recovery and reporting requirements.
Responsibility is shared: technical responders handle investigation and remediation, while designated owners oversee coordination, approvals, communications, and alignment with governance obligations.
Incident response focuses on managing and mitigating the security incident, while disaster recovery focuses on restoring services and systems to meet availability and recovery objectives.
Playbooks are step-by-step procedures for specific incident types (e.g., phishing, ransomware) and are used to speed up decisions, reduce errors, and ensure consistent response.
Classify incidents using defined criteria such as impact, scope, data sensitivity, operational disruption, and likelihood of harm, then assign severity to drive escalation and timelines.
Common mistakes include unclear ownership, poor logging and evidence handling, delayed containment, inconsistent communications, and skipping lessons learned and control improvements.
After resolution, document the timeline and root causes, validate recovery, update controls and playbooks, complete required reporting, and track corrective actions to closure.
| Version | Date | Author | Description |
|---|---|---|---|
| 1.0.0 | 2026-02-26 | WatchDog Security GRC Wiki Team | Initial publication |
