Question 840
At the Brookfield property management business, an infected laptop emits thousands of unusually long random-looking DNS subdomains to one unfamiliar domain. Which ongoing control best prevents this issue from recurring?
Explanation
Correct Answer
The continuing safeguard is to review DNS logging coverage and allowlist exceptions. It helps avoid the original condition: dNS can carry encoded outbound data through a nominal name resolution channel.
Incorrect Answers
Monitor abnormal forwarding-rule changes. That safeguard would help prevent recurrence of: An apparently normal email workflow can automatically replicate sensitive messages off-site. The risk being reviewed here is instead: DNS can carry encoded outbound data through a nominal name resolution channel. The matching ongoing control is: Review DNS logging coverage and allowlist exceptions.
Review guest account expiration and segmentation periodically is not the primary recurring safeguard for this problem. The team should review DNS logging coverage and allowlist exceptions. For the Brookfield property management business, the direct corrective action is to investigate DNS query length entropy frequency and destinations with appropriate security controls.
Review application allowlists after authorized kiosk upgrades. That safeguard would help prevent recurrence of: Unrestricted executable launch increases malware and misuse opportunities on fixed-purpose endpoints. The risk being reviewed here is instead: DNS can carry encoded outbound data through a nominal name resolution channel. The matching ongoing control is: Review DNS logging coverage and allowlist exceptions.