Phantom Database-Hacker???

[silverleaf]

I checked my cpanel and there is a new database on my server with the name extension _frgn1. There is also a username with the same extension added to that database. I am fairly new to vbulletin, so I'm at a loss for where this came from.

Is this the work of a hacker, or would a mod I installed have created a database?

I am the only admin., so how could this have been added??

The reason I checked my cpanel was because my site has been running slow, but most of the time the server load is under 2.

any suggestions?