I know this is late, but it could help others:
If you have the Splunk Add-on for Windows installed, you will get two fields when looking at 4720 events, the user and the src_user . In the context of this event, the src_user is the user creating the account and the user is the user being created.
Note that per the Common Information Model, this isn't correct, and you would expect the user to be the user creating the action and the user being created should be in a field named object . So, in this case, the TA is incorrect.
HTH,
Dave
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