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Penguin, did you find a reference to that sk.tar.gz file on your system?
If you did, you're definitely 0wn3d :eek:

Take the system off-line, backup your data and reinstall everything from...

Und3ertak3r already noted it. You seem to have a user named rootbeer. If you didn't create it you're screwed. If it is an account you've created, it probably has a simple password. Someone may have...