What is this account "1B9E3760"?

[cschelin]

I keep seeing the account name 1B9E3760 in our Windows security logs, only when an account has failed to log in. (But not every time an account has failed to log in.) The only thing that we've found is that this may be related to "logon as a service".

Where would I even begin to look for more info on what this is?

[#2]

@cschelin 

In my case it is vulnerability scanner  InsightVM - Rapid7 https://www.rapid7.com/products/insightvm/