Security incident response is the organized handling of a suspected breach from first report through containment, recovery, and learning.
It is a process with owners and steps, not the room where analysts sit and not the tool that stores the logs.
How it works
A useful plan names who declares an incident, how to isolate affected systems, how evidence is kept, and who speaks to customers or regulators.
Practice matters, because the first hour is a poor time to invent roles.
Response includes recovery choices such as restoring clean backups and rebuilding systems that cannot be trusted.
It does not include payment instructions for criminals, and it does not publish attack procedures.
Concrete examples
- A late night alert becomes an incident when a duty lead confirms customer data may have moved.
- The plan tells staff to disconnect a host from shares before anyone starts a long debate.
- After restoration, the team writes what was late, what evidence was missing, and which control to add.
Protective measures
- Assign a duty lead and a deputy, and publish how any employee can reach them at any hour.
- Isolate affected systems, preserve logs on a separate store, and restore only from backups you trust.
- Prepare customer and regulator notice paths in advance so legal review does not start from a blank page.
- Hold a short review after each incident and change the plan where people had to improvise.