Your security team has recently deployed a new security information and event management (SIEM) system. As part of your role, you have been asked to report on key performance indicators that will help gauge the effectiveness of the new system. Which KPI would best indicate how well the SIEM is improving the team's ability to detect threats?
The Mean Time to Detect (MTTD) metric is a key performance indicator that measures the average time it takes for the team to discover a threat from when it initially occurs. This metric is directly associated with the detection capabilities of the SIEM system, as it is designed to identify and alert the team of suspicious activity. A lower MTTD signifies that the SIEM is effectively reducing the time taken to detect threats. The Mean Time to Remediate is related to the resolution of incidents after detection, Alert Volume could increase due to improved detection but doesn't measure efficiency, and Mean Time to Contain references the duration to limit the spread of an incident, not the detection time.
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