Has My Machine Been Hacked (I Don't Believe So, But ...) ..?

Hi,
I returned last night from two weeks away, during which I'd left my machine open to ssh and VNC, so that I could login from abroad. The VNC port is standard, but I'm the only one who can use it (Remote Desktop preferences), whereas the ssh port is non-standard, and the only two users who have valid shells are me and a friend whom I trust completely.
I get in last night, shut down the screensaver and note that a text file on my desktop has been renamed, and then this morning I wonder why my leafnode setup isn't updating newsgroups so I do a..
+sudo -e crontab+.
Imagine my surprise when the system didn't even ask for my password, but put me directly into vim, with, I might add, an empty cron file!
Whilst on holiday, I was connected to this machine almost daily, and I couldn't see anything untoward. In addition, leafnode was functionning correctly. I connected using putty from a Windows machine.
Is there another explanation for this, or does it look like someone has had his grubby paws where they shouldn't have been ?
Thanks.
D.C.
PS forgot to mention: my password is very complex (digits, mixed case, non-Latin characters), and is 9 characters long, so I'd be very surprised if someone's managed to crack it ...
Message was edited by: D.C.

A warranty replacement can be a new or refurbished unit as specified in the warranty terms.
A warranty replacement will have warranty for the balance of the original term or 90 days, whichever is longer.
All perfectly normal.

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Has My Machine Been Hacked (I Don't Believe So, But ...) ..?

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