Upon concluding the containment and eradication of a sophisticated network intrusion, your team is moving into the recovery and post-incident phases. Identifying priority actions is key to enhancing resilience against future attacks. Which of the following actions is paramount for the organization to perform immediately after restoring services?
Implementing new sandboxing techniques for email attachments to prevent similar malware infections
Running an immediate full-scale audit on all security systems to check for remaining threats
Revising the organization's firewall and network perimeter policies based on the specific attack vectors that were exploited
Initiating a lessons learned session with key response team members to evaluate the incident response effectiveness and outline improvement strategies
While all the options are part of a comprehensive post-incident process, the lessons learned session is the most critical immediate step. According to incident response best practices, this session serves to analyze the recent incident and response, fostering continuous improvement and informing all other strategic and tactical changes. The session's outputs guide the revision of policies and the implementation of new technical controls, making it the most strategically important first action in the post-incident phase. The other actions are typically outcomes of a lessons learned review.
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Why is a lessons learned session critical after an incident?
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Who should participate in a lessons learned session and why?