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#11
i feel like NTAUTHORITY was a thing in XP maybe 7 but they stopped it because it was a way to hack. I know its to do with system level stuff but there is not much information online i can wrap my head around tbh.
I could be just thinking this but i don't think its common to see the user name or it might of got renamed in later versions of windows. The web searches are kind of suggesting that it is not common else you would be able to find the right information or even someone else talking along the same lines.