Indicent Response

Security Concepts

Definition

Incident Response is the structured process that organizations use to detect, investigate, and recover from security incidents. The goal is to limit damage, restore normal operations as quickly as possible, and learn from what happened. It ensures that defenders act with purpose instead of reacting in confusion when something goes wrong.

When a security incident occurs, responders follow a plan that outlines who does what, which systems need immediate attention, and how to communicate with technical teams, leadership, and sometimes legal or law enforcement.

Most organizations use a six stage Incident Response lifecycle:

1. **Preparation**
   Build tools, processes, and training so the team is ready before an incident happens.

2. **Detection and Analysis**
   Identify suspicious activity, gather evidence, and confirm whether a true incident is in progress.

3. **Containment**
   Stop the attacker or malicious activity from spreading. This might include isolating systems or blocking access.

4. **Eradication**
   Remove the attacker’s access and eliminate any malicious files or tools they installed.

5. **Recovery**
   Restore systems to a safe, trusted state and return to normal business operations.

6. **Lessons Learned**
   Review what happened and improve defenses or procedures to reduce the chance of a repeat incident.

**Example**
A phishing email leads to an attacker accessing a user’s mailbox. The Incident Response team:

* Detects the unauthorized access
* Resets the account password and terminates all sessions
* Removes forwarding rules the attacker created
* Restores trust in the affected systems
* Updates mail filtering rules to block similar phishing attempts

**Why it matters**
No organization can prevent every cyber attack, but a strong Incident Response capability minimizes harm. It protects business operations, customer trust, and critical data by turning a crisis into a manageable event.

Indicent Response

Definition

Explore More Terms