Defense

Incident Response

The structured process an organization follows to detect, contain, investigate, and recover from a security incident.

Definition

Incident response is the organized approach an organization uses to prepare for, detect, contain, eradicate, and recover from a security incident, such as a malware infection, data breach, or successful phishing attack. It is typically guided by a documented plan that assigns roles, communication procedures, and technical steps in advance of an actual incident.

A typical incident response process follows several phases: preparation, where plans, tools, and trained personnel are put in place before anything happens; detection and analysis, where an alert or report is investigated to confirm and scope an incident; containment, where affected systems are isolated to stop further damage; eradication and recovery, where the root cause is removed and systems are safely restored; and a post-incident review that captures lessons learned. Each phase depends on clear ownership, since confusion about who is responsible for a decision slows the response when speed matters most.

Incident response matters because the difference between a well-handled incident and a poorly handled one is often measured in cost, regulatory exposure, and reputational damage rather than whether an incident occurred at all, since even mature organizations experience incidents. For regulated sectors in Indonesia, a documented and tested incident response capability is frequently an explicit compliance expectation under frameworks like ISO 27001 and OJK guidance, not merely a best practice. Organizations without a rehearsed plan tend to lose critical time during the first hours of an incident, which is often when containment matters most.

Running regular tabletop exercises that simulate realistic incidents, such as a ransomware infection or a successful phishing campaign, helps teams identify gaps in the plan before a real incident exposes them. Maintaining an up to date contact list, including legal, communications, and external forensic support, ensures the right people can be reached quickly regardless of when an incident occurs. Every employee has a role in incident response even if they are not on the formal team, since reporting a suspicious email or unusual system behavior promptly is often what starts the detection phase.

At a glance

Type
Detective and response control
Also known as
IR

How it works

  1. 1

    Preparation: plans, tools, and trained personnel are put in place before anything happens.

  2. 2

    Detection and analysis: an alert or report is investigated to confirm and scope an incident.

  3. 3

    Containment: affected systems are isolated to stop further damage.

  4. 4

    Eradication and recovery: the root cause is removed and systems are safely restored.

  5. 5

    Post-incident review: lessons learned are captured to strengthen the plan for next time.

Key points

  • A documented plan assigns roles and communication steps before an incident happens
  • Clear ownership of decisions is critical since confusion slows response when speed matters most
  • Regulated organizations in Indonesia often face explicit compliance expectations for incident response under ISO 27001 and OJK guidance
  • Every employee has a role, since reporting suspicious activity promptly often starts the detection phase
  • The cost of an incident is often measured more by response quality than by whether it happened at all

Best practices

  • Maintain a documented, tested incident response plan with assigned roles
  • Run regular tabletop exercises simulating realistic incidents such as ransomware or phishing
  • Keep an up to date contact list including legal, communications, and forensic support
  • Encourage every employee to report suspicious activity promptly, not just the formal response team
  • Capture lessons learned in a post-incident review and update the plan accordingly

Real-world example

An employee at a logistics company notices an unusual pop-up on their laptop and reports it immediately instead of dismissing it. The security team isolates the machine within minutes, confirms a malware infection before it spreads, and closes the incident the same day thanks to the early report and a rehearsed containment procedure.

How Claro helps

Claro's phish reporting workflow feeds directly into the detection phase of incident response, giving security teams an early signal when an employee spots and reports a real phishing attempt.

Frequently asked questions

What are the main phases of incident response?

Preparation, detection and analysis, containment, eradication and recovery, and a post-incident review. Each phase depends on clear ownership so decisions are not delayed.

Why does incident response matter if a breach still happens?

Even mature organizations experience incidents. The difference between a well-handled and poorly handled incident is usually measured in cost, regulatory exposure, and reputational damage, not whether it occurred.

What is a tabletop exercise?

A tabletop exercise is a simulated incident, such as a ransomware infection, that a team walks through step by step to find gaps in the response plan before a real incident exposes them.

Do employees outside the security team have a role in incident response?

Yes. Reporting a suspicious email or unusual system behavior promptly is often what starts the detection phase, making every employee part of the response chain.

Related terms

Data Breach

An incident in which sensitive, protected, or confidential information is accessed, disclosed, or stolen without authorization.

Zero-Day

A software vulnerability that is unknown to the vendor and has no available patch, leaving no time (zero days) to prepare a defense before it is exploited.

Phishing Simulation

A controlled, authorized exercise that sends realistic but harmless fake phishing messages to employees to measure how they respond and to train safer behavior.

Security Culture

The shared attitudes, beliefs, and everyday behaviors around security that exist across an organization, beyond formal policy and training.

Reduce your human risk

Claro measures and lowers the risk these terms describe, in English and Bahasa Indonesia.

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