Question 990
At Seabright Municipal Works, a team reports that it corrected the following problem affecting public service networks and records: A file detection repeats under different filenames while its digest is unchanged. Which observation BEST verifies that the correction actually worked?
Explanation
Correct Answer
The investigation shows one related campaign without double-counting separate file names. This is the decisive evidence for the original problem: A file detection repeats under different filenames while its digest is unchanged. It verifies that the intended corrective control—Group events by verified file hash and correlate devices and event timing—works in the relevant environment; a completed change ticket alone would not prove the outcome at Seabright Municipal Works.
Incorrect Answers
Historical sightings are correlated and the affected endpoints are contained or cleared. This would be relevant evidence for a different failure: An endpoint shows file detection after a verdict changed from unknown to malicious days later, usually addressed by Use retrospective detection events and file trajectory to locate prior exposure and respond. It does not demonstrate that the current problem at Seabright Municipal Works was resolved. The specific required evidence is: The investigation shows one related campaign without double-counting separate file names.
The incident record identifies file origin, process lineage, and action outcome. This would be relevant evidence for a different failure: An event references a quarantined object but investigators cannot tell its source or execution chain, usually addressed by Examine endpoint process and file trajectory metadata in the Secure Endpoint event. It does not demonstrate that the current problem at Seabright Municipal Works was resolved. The specific required evidence is: The investigation shows one related campaign without double-counting separate file names.
Investigation separates exposed-only devices from a confirmed active compromise. This would be relevant evidence for a different failure: Several detections share the same hash but only one device shows outbound command activity, usually addressed by Correlate file events with network and process telemetry instead of assuming equal host severity. It does not demonstrate that the current problem at Seabright Municipal Works was resolved. The specific required evidence is: The investigation shows one related campaign without double-counting separate file names.