Question 1130
At Elmwood Manufacturing, a team reports that it corrected the following problem affecting industrial analytics and business systems: A malicious process attempts to leak data through ICMP payloads rather than common web ports. Which observation BEST verifies that the correction actually worked?
Explanation
Correct Answer
The covert-transfer test creates an alert and cannot move meaningful protected data. This is the decisive evidence for the original problem: A malicious process attempts to leak data through ICMP payloads rather than common web ports. It verifies that the intended corrective control—Monitor unusual ICMP volume and payload patterns and limit unneeded egress traffic—works in the relevant environment; a completed change ticket alone would not prove the outcome at Elmwood Manufacturing.
Incorrect Answers
A protected data sample is stopped across relevant channels rather than just FTP. This would be relevant evidence for a different failure: A team blocks FTP exfiltration but ignores equivalent paths through secure chat and file-sharing apps, usually addressed by Use application-aware egress policy and DLP across approved and unapproved transfer channels. It does not demonstrate that the current problem at Elmwood Manufacturing was resolved. The specific required evidence is: The covert-transfer test creates an alert and cannot move meaningful protected data.
Unapproved outbound file-transfer traffic is denied and correlated with source activity. This would be relevant evidence for a different failure: An internal server opens unexpected outbound SSH/SCP sessions to unknown Internet destinations overnight, usually addressed by Apply egress controls and investigate host and flow telemetry for unauthorized transfer. It does not demonstrate that the current problem at Elmwood Manufacturing was resolved. The specific required evidence is: The covert-transfer test creates an alert and cannot move meaningful protected data.
Normal time synchronization works and the unexpected transfer path is blocked. This would be relevant evidence for a different failure: A host sends repeated NTP packets with unusual application-sized content to an external endpoint, usually addressed by Detect protocol-abuse deviations and restrict NTP to approved time sources. It does not demonstrate that the current problem at Elmwood Manufacturing was resolved. The specific required evidence is: The covert-transfer test creates an alert and cannot move meaningful protected data.