Random connection from user transferring files back to themself.

SUPREMEMASTER

As you can imagine, I do not know who that is, but my password is a 10 character randomly generated password.
The logs indicate that files were transferred. Hundreds of them.
Not sure what else to say. If anyone sees this ID connecting to them randomly they should report it.

Something I forgot to mention: My mouse did move around on my screen a few times at one point. The mouse pointer tried to click on a "Deny" button while I was browsing around on teamviewer website, and then moved to the bottom of the screen and stopped moving.