The rule titled 'Abnormally High AWS Instances Terminated by User' aims to detect unusual termination activities of AWS EC2 instances performed by users, specifically when a significant number of instances (beyond a calculated threshold) are terminated within a 10-minute time window. This detection relies on CloudTrail logs and utilizes statistical analysis, particularly calculating an average and standard deviation of instances terminated by users over the specified timeframe to identify outliers. The rule is deprecated and suggests transitioning to the latest Change Data Model for better detection capabilities. Note that this detection mechanism may produce false positives, particularly from service accounts that routinely manage instances and thus may need adjustments to the threshold settings to filter out such anomalies appropriately.