Question 420
Before a monitored change is approved, the SOC finds: A failed-login detector reaches its threshold across ten unrelated users and generates an account-compromise alert for one person. Which assurance step most directly controls this future failure mode?
Explanation
Correct Answer
This safeguard directly addresses threshold grouping mixes multiple users: Validate aggregation keys with synthetic multi-user test records before enabling notifications. The risk being prevented is: Aggregating all failures globally instead of grouping by a relevant user key can manufacture a false account-centric pattern. A safeguard aimed at another fault would not control this issue.
Incorrect Answers
A suppression kept beyond its legitimate time window can conceal subsequent security-relevant activity. “Use time-limited exceptions and alert on active suppressions that exceed the stated business reason” would remedy that alternative situation, but it would not correct the present issue: aggregating all failures globally instead of grouping by a relevant user key can manufacture a false account-centric pattern.
“Require peer review and expiration for high-impact event suppression changes” is the supported response when suppression criteria without precise identity and event scope can hide unrelated true-positive detections. Here the decisive response is “Validate aggregation keys with synthetic multi-user test records before enabling notifications”, so that different intervention does not meet the stated requirement.
Configuring a handler's rules is insufficient until the handler is enabled for event generation. “Include status checks and positive test evidence in detection deployment signoff” applies to that other condition. The reported evidence is a failed-login detector reaches its threshold across ten unrelated users and generates an account-compromise alert for one person; this alternative would address the wrong dependency.