signal.rule.name:* and user.name:* and not user.id:("S-1-5-18" or "S-1-5-19" or "S-1-5-20")
Install detection rules in Elastic Security
Detect Multiple Alerts Involving a User in the Elastic Security detection engine by installing this rule into your Elastic Stack.
To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).