Amazon GuardDuty has further optimized the analysis of AWS CloudTrail logs resulting in reduced GuardDuty cost for many customers. Cost reductions will vary by customer based on their volume of AWS CloudTrail logs. Customers with high-volumes of global CloudTrail events will see the greatest net positive impact. We introduced the first round of CloudTrail log analysis improvement in June 2018. This next optimization is a continuation of our efforts to reduce GuardDuty costs for customers, while at the same time continuously adding security value by introducing new detections and improving existing detections in the service.