Which AWS service provides insights into suspicious activities across various services?

The most appropriate service for gaining insights into suspicious activities across various AWS services is AWS GuardDuty. GuardDuty is a managed threat detection service that continuously monitors for malicious activity and unauthorized behavior to protect your AWS accounts, workloads, and data. It analyzes data from multiple sources, including AWS CloudTrail event logs, VPC Flow Logs, and DNS logs, to identify potential threats.

This service utilizes machine learning, anomaly detection, and integrated threat intelligence to provide actionable security findings, allowing organizations to respond promptly to potential security incidents. By using GuardDuty, users benefit from ongoing threat monitoring without the need for further configuration or management of the detection mechanism.

While AWS Security Hub aggregates security alerts from various AWS services and provides a comprehensive view of security posture, it doesn't specifically focus on detecting suspicious activities. AWS Config monitors configuration compliance but not suspicious activities, and AWS CloudTrail records API calls and provides log data but does not directly analyze for threats. Therefore, GuardDuty stands out as the primary service designed specifically for threat detection and insights into suspicious activities within the AWS ecosystem.