Building your first detection

Detections monitor data stores for specified patterns and then take some action when a pattern match occurs. These actions can be anything from adding data to a queue to triggering an alert that sends a message to a defined audience. To see some of this in action, in this section, we will walk through the process of creating a very simple detection, or rule, for failed login attempts that rise over a specified threshold.

It’s important to emphasize that this is not a very good detection for reasons we will elaborate on in later chapters, but it will give you an understanding of the general mechanics of detections:

1. First, log in to your Elastic Stack and click the hamburger icon from the top-left corner. Then, navigate to Manage under the Security section. From there, click on Rules. This will take us to the Create new rule page.
2. Click Threshold, leave the default sources as is, then enter event.code: 4625 AND winlog.channel: &quot...