Question 520
A security operations team receives this change request: An incident owner closes a case immediately after quarantining a host, but the forensic analysis and recovery validation are still pending. Which ongoing safeguard best addresses the original risk?
Explanation
Correct Answer
Require defined resolution criteria and closure approvals for high-severity incidents. This long-term control addresses the recurring risk. The technical reason is: Containment and completed investigation are different stages of response; action success alone does not prove case closure. A later acceptance test still needs to confirm: The incident retains pending tasks until evidence and recovery validation are complete.
Incorrect Answers
This safeguard, “Audit containment connectors and required privileges without granting blanket administrative access”, reduces a different source-defined risk: A responder tries to block a known-bad address directly from an incident, but the Block control is unavailable and no authorized integration exists. That risk depends on: Incident blocking controls require both an actionable indicator and the corresponding permitted connector path. The recurring problem here is an incident owner closes a case immediately after quarantining a host, but the forensic analysis and recovery validation are still pending. The originally selected control “Require defined resolution criteria and closure approvals for high-severity incidents” is more specific because containment and completed investigation are different stages of response; action success alone does not prove case closure.
This safeguard, “Require observation-backed evidence for confirmed incident status”, reduces a different source-defined risk: A newly imported intelligence indicator is marked malicious but has no corresponding observed event in the environment, and an analyst claims an actual breach occurred. That risk depends on: Intelligence about an indicator is not evidence that the environment encountered it; observation and reputation are separate facts. The recurring problem here is an incident owner closes a case immediately after quarantining a host, but the forensic analysis and recovery validation are still pending. The originally selected control “Require defined resolution criteria and closure approvals for high-severity incidents” is more specific because containment and completed investigation are different stages of response; action success alone does not prove case closure.
This safeguard, “Require incident ownership and closure notes for escalated security events”, reduces a different source-defined risk: An analyst identifies a suspicious authentication event but the security team requires a tracked investigation with assigned ownership and comments. That risk depends on: An incident is a tracked investigation container, not merely another raw device log. The recurring problem here is an incident owner closes a case immediately after quarantining a host, but the forensic analysis and recovery validation are still pending. The originally selected control “Require defined resolution criteria and closure approvals for high-severity incidents” is more specific because containment and completed investigation are different stages of response; action success alone does not prove case closure.