User impersonation by Identity Protection alerts

Original query, unchanged.

// Retrieve SecurityAlerts generated within the last day
 SecurityAlert 
 // Filter alerts for Azure Active Directory Identity Protection and High severity
 | where ProductName has "Azure Active Directory Identity Protection"
 | where AlertSeverity == "High"
 // Extract IP address entities from the 'Entities' field
 | extend ipAddress = extract(@'\b(?:\d{1,3}\.){3}\d{1,3}\b', 0, Entities)
 // Filter out alerts without IP address entities
 | where isnotempty(ipAddress)
 // Summarize entities per unique combination of attributes
 | summarize make_set(Entities)
     by
     AlertTime = TimeGenerated,
     ipAddress,
     AlertName,
     ProductName,
     AlertSeverity
 // Perform an inner join with AWS CloudTrail events
 | join kind=inner (
     AWSCloudTrail
     | where isempty(ErrorMessage)
     | extend UserType = tostring(parse_json(RequestParameters).userType) 
     | where EventName in~ ("CreateRole", "DeleteRole", "CreateUser", "CreateAccessKey", "DeleteAccessKey", "CreateGroup", "AddUserToGroup", "ChangePassword", "DeleteGroup", "DeleteUser", "RemoveUserFromGroup", "CreateVirtualMFADevice", "DeleteLoginProfile") 
     | summarize
         make_set(RequestParameters),
         make_set(ResponseElements)
         by
         SourceIpAddress,
         UserIdentityArn,
         UserIdentityType,
         EventName,
         EventTime = TimeGenerated
     )
     on $left.ipAddress == $right.SourceIpAddress  
 // Filter results based on temporal correlation
 | where AlertTime between ((EventTime - 1h) .. (EventTime + 1h))