Often an attack will include the creation of a new user, followed by permissions being elevated to an admin level. You need to find these accounts so that you can take action, if needed.
How to use Splunk software for this use case
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For more great content from the Splunk Education team, check out Splunk How-To on YouTube or sign up for a course. In addition, these Splunk resources might help you understand and implement this search:
- Data Descriptor: Windows event logs