Windows:Virtual Accounts
From Devguid
About
Virtual account is an account associated with a specific Windows service. It's the same name as of the specific service. Note that you are probably not able to use checknames when adding it to folders but it will still work when using the "NT Service\MyServicename" username.
The purpose is to improve security and to isolate what services have access to.
Adding port opening to service
netsh http add urlacl url=http://+:8001/ user="NT Service\MyServiceName"
Links
https://superuser.com/questions/1035324/how-to-create-local-windows-desktop-service-accounts
https://superuser.com/questions/1035324/how-to-create-local-windows-desktop-service-accounts