root shown as logged on by "w" --- Normal ?
"w" shows this:
Is this normal ? Who is this "root" ?
This is the root user. The root user is the core user of your OS. This indicates they are running something with the BASH shell. They are logged in as tty1 and locally. So while it's not clear what exactly they are doing it doesn't appear suspicious. In fact, this is likely the console logged in as root, as that would generate the tty1 response.
You can log out by going to the
Console and opening the console and logging out there.