Question 850
At Brightstone Legal, a team reports that it corrected the following problem affecting client matters and confidential documents: Investigators cannot tell which process spawned a malicious downloader on a compromised laptop. Which observation BEST verifies that the correction actually worked?
Explanation
Correct Answer
The event timeline shows parent-child execution and associated file activity. This is the decisive evidence for the original problem: Investigators cannot tell which process spawned a malicious downloader on a compromised laptop. It verifies that the intended corrective control—Use endpoint process-tree telemetry and forensic context from an EDR solution—works in the relevant environment; a completed change ticket alone would not prove the outcome at Brightstone Legal.
Incorrect Answers
A high-severity test detection creates an assigned incident with timely action. This would be relevant evidence for a different failure: A security program relies only on endpoint detection and lacks ownership for responding to high-severity alerts, usually addressed by Define EDR response roles, escalation, evidence preservation, and containment procedures. It does not demonstrate that the current problem at Brightstone Legal was resolved. The specific required evidence is: The event timeline shows parent-child execution and associated file activity.
The test endpoint stops unauthorized network traffic while management or response access remains. This would be relevant evidence for a different failure: A laptop's antivirus flags a file as malicious but staff cannot contain network communication during triage, usually addressed by Use approved endpoint isolation or containment in the incident-response process. It does not demonstrate that the current problem at Brightstone Legal was resolved. The specific required evidence is: The event timeline shows parent-child execution and associated file activity.
Authorized tools execute and known malicious test objects remain blocked. This would be relevant evidence for a different failure: Endpoint malware prevention blocks benign developer tools because every unsigned file receives the same response, usually addressed by Tune EPP policy by verified publisher, reputation, and controlled exceptions. It does not demonstrate that the current problem at Brightstone Legal was resolved. The specific required evidence is: The event timeline shows parent-child execution and associated file activity.