This rule detects the usage of the AWS API to retrieve cost and usage metrics through the 'GetCostAndUsage' operation. Adversaries may leverage this information to identify active accounts with potentially high expenses, allowing them to target resources that may go unnoticed during malicious activities. The Splunk logic processes AWS CloudTrail logs, extracting relevant fields such as timestamps, source IPs, and user details, while enhancing the data with geographical location information derived from IP addresses. It aggregates these metrics over a span of 1 second and logs access patterns, which can help in identifying abnormal behaviors indicative of reconnaissance or resource manipulation.