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Training Camp • Cybersecurity Glossary
A dedicated team (also CSIRT/CERT) that detects, contains, eradicates, and recovers from cyber incidents using tested playbooks.
Security Incident Response Team (SIRT) Definition: A dedicated team (also CSIRT/CERT) that detects, contains, eradicates, and recovers from cyber incidents using tested playbooks.
A Security Incident Response Team (SIRT), also called a CSIRT or CERT, is a dedicated group responsible for identifying, containing, eradicating, and recovering from cybersecurity incidents before damage escalates. It combines technical specialists, such as forensic analysts, malware reverse engineers, and threat hunters, with coordination roles to manage incidents from first alert through post-incident review.
The team operates across the recognized incident response lifecycle: preparation (defining roles, playbooks, and training), detection and analysis (correlating logs and alerts, triaging severity), containment (isolating hosts and blocking malicious indicators), eradication (removing malware and closing the exploited vector), recovery (restoring and monitoring systems), and lessons learned. This maps to frameworks like NIST SP 800-61 and SANS PICERL. Many organizations house the SIRT inside a 24/7 Security Operations Center or augment it with managed detection and response.
The SIRT matters because the speed and discipline of response directly determine breach impact. Without a trained team and tested plan, organizations make slow, ad hoc decisions during a crisis, prolonging attacker dwell time, increasing data loss, and complicating legal and regulatory obligations. A capable SIRT shortens containment time, preserves forensic evidence, and coordinates legal, HR, and communications so business and disclosure decisions are sound.
For example, an EDR alert flags ransomware encrypting files on a finance workstation at 2 a.m. The on-call SIRT analyst confirms the detection, isolates the host from the network to halt lateral spread, identifies the strain and its command-and-control domains, blocks those at the firewall, and checks other endpoints for the same indicators. After eradicating the malware and restoring data from backups, the team runs a post-incident review, finding the entry point was a phishing email, and updates email filtering and user training. Regular tabletop exercises keep the team ready for the next real event.
Security Incident Response Team (SIRT) is one of the topics you'll master in the CISM Boot Camp.
CISM Boot Camp →