You can enable the FortiSIEM management extension application (MEA) on FortiAnalyzer. FortiSIEM uses machine learning to detect unusual user and entity behavior (UEBA) without requiring the administrator to write complex rules. FortiSIEM helps identify insider and incoming threats that would pass traditional defenses. High fidelity alerts help prioritize which threats need immediate attention.
For details about using FortiSIEM MEA, see the FortiSIEM MEA Administration Guide on the Document Library.