What is Incident Response? Definition & Compliance Guide

What is Incident Response?

Incident response (IR) is the organized approach to detecting, managing, and recovering from security incidents such as data breaches, malware infections, unauthorized access, and denial-of-service attacks. An effective incident response program minimizes damage, reduces recovery time, and preserves evidence for investigation and compliance purposes.

The incident response lifecycle

Most incident response programs follow the NIST SP 800-61 framework, which defines four phases:

1. Preparation

Develop and document the incident response plan
Establish the incident response team and define roles
Deploy detection and monitoring tools
Conduct training and tabletop exercises
Establish communication channels and escalation procedures
Prepare forensic tools and evidence collection procedures

2. Detection and analysis

Monitor systems for indicators of compromise (IOCs)
Triage alerts to distinguish real incidents from false positives
Determine the scope, severity, and impact of the incident
Classify the incident (data breach, malware, unauthorized access, etc.)
Document findings and initial assessment

3. Containment, eradication, and recovery

Contain the incident to prevent further damage (short-term and long-term containment)
Eradicate the root cause (remove malware, close vulnerabilities, revoke compromised credentials)
Recover affected systems to normal operations
Verify that systems are clean and functioning properly
Monitor for signs of recurring activity

4. Post-incident activity

Conduct a lessons-learned review
Document the incident timeline, actions taken, and outcomes
Identify improvements to prevent similar incidents
Update the incident response plan based on lessons learned
Fulfill any regulatory notification requirements

Incident response team

An incident response team typically includes:

Incident commander — leads the response effort and makes key decisions
Security analysts — perform technical investigation and containment
IT operations — support system recovery and infrastructure changes
Legal counsel — advise on regulatory obligations and liability
Communications — manage internal and external communications
Executive sponsor — provides management authority and resources

Incident response in compliance frameworks

SOC 2 — CC7.3 and CC7.4 require procedures for responding to identified security events and recovering from incidents
ISO 27001 — controls A.5.24 through A.5.28 address incident management planning, assessment, response, and learning
HIPAA — the Security Rule requires security incident procedures (45 CFR 164.308(a)(6)), and the Breach Notification Rule mandates notification following PHI breaches
NIST CSF — the Respond function (RS) addresses response planning, communications, analysis, mitigation, and improvements

Tabletop exercises

Regular tabletop exercises test the incident response plan in a low-pressure setting. The team walks through a hypothetical scenario, discussing decisions and actions at each stage. Tabletop exercises help identify gaps in the plan, clarify roles, and build team readiness without the stress of a real incident.

Common pitfalls

No documented incident response plan
Team members unsure of their roles during an incident
Failure to preserve evidence for investigation
Delayed or incomplete regulatory notification
Not conducting post-incident reviews

How episki helps

episki provides incident response plan templates, tracks tabletop exercises, and maintains documentation for compliance evidence. The platform includes breach notification workflows with timeline tracking to ensure regulatory deadlines are met. Learn more on our compliance platform.

What is Incident Response?