At present Joins are not supported in UDM Search, but this is on the roadmap for later on in the year.

A potential workaround, and depending on the number of results you need, is to use Detection Engine and write a multi-event detection (not a detection alert), and then you can use outcome variables to output a table of values that you need.  You can then view the results in Detection View, or else create a Dashboard of the results.

Alternatively, if you have an export of your event data into BigQuery, you can use SQL with a Join statement.

HI,

Could you clarify what you meant by use Detection Engine and write a multi-event detection (not a detection alert)?

What actions should I undertake to achieve this?

Thanks

If you use the rules editor and write a rule, you can build a detection. Below is a quick primer on how to write a multi-event rule. The detection v alert is a toggle in the rule editor that provides a method to not generate an alert in queue that someone might triage and just have a detection that can be viewed in the UI. I liken detection v alert to running a rule in an evaluation mode prior to deploying it to the the team who is tasked with triage and responding to alerts.

https://www.googlecloudcommunity.com/gc/Community-Blog/New-to-Google-SecOps-Multi-Event-Rules/ba-p/722663