DFIR

What is DFIR?

DFIR, or Digital Forensics & Incident Response, is the discipline that combines digital forensic investigation with cybersecurity incident response. Its objective is to analyse an attack in depth, contain it, and understand what happened in order to prevent future incidents. It includes the collection and preservation of digital evidence, the technical analysis of the attack, and the implementation of corrective measures.

Why is it important for businesses?

Because it enables organisations to determine the true scope of an incident, identify how it occurred, understand which systems were affected, and assess whether any information was exfiltrated. DFIR also helps companies comply with regulatory requirements, such as breach notification, and provides the evidence needed for legal actions. A mature DFIR capability speeds up recovery, reduces the impact of the attack, and strengthens the organisation’s resilience.

How is it applied in practice?

It involves activities such as the collection and forensic analysis of endpoints and servers, malware investigation, attack timeline reconstruction, and identification of the initial vector. In an operational environment like Telefónica Tech’s DOC, DFIR integrates with SIEM, SOAR, XDR, and the SOC to automate detection, accelerate response, and provide detailed reporting that supports continuous security improvement.