Question 580
When validating a security detection workflow, the team notes: A PDF attachment is rejected by a gateway and analysts search only malware signatures even though the object triggered a file-type rule. Which technical explanation most directly accounts for these observations?
Explanation
Correct Answer
The underlying principle is: File filtering can block an object by its type without an antivirus malware verdict. Address this by: Inspect the file-filter event subtype, detected file type, policy and enforcement action. The confirming operational observation is: The block is attributed to the correct rule, with no fabricated malware detection in the report.
Incorrect Answers
Identical usernames do not prove both sessions originated from the same approved management path. “Correlate login events by source IP, time, authentication method and administrative action history” would remedy that alternative situation, but it would not correct the present issue: file filtering can block an object by its type without an antivirus malware verdict.
“Filter administrative event logs by user, source, outcome and interval and compare with successful access or account lockout events” is the supported response when a pattern of failed authentications can indicate brute-force activity even when no login has succeeded. Here the decisive response is “Inspect the file-filter event subtype, detected file type, policy and enforcement action”, so that different intervention does not meet the stated requirement.
A DLP match is evidence of a policy condition and its action must be checked to determine whether transfer was blocked or permitted. “Inspect DLP log action, matched rule, relevant content metadata and corresponding traffic session” applies to that other condition. The reported evidence is a PDF attachment is rejected by a gateway and analysts search only malware signatures even though the object triggered a file-type rule; this alternative would address the wrong dependency.