Wow nice tracing. How do you do that? Al I can do is whois someone by there ip.
(talking to the owner of that site now) Seems to me that you got attacked by a defacer. Maybe its a try out for a group or just showing of theire skills. If nothing else happend they will quite in a while. I would let wildred do some scans and testing. I don't know much about server but maybe you can install it with a firewall if thats possible. By the way are your log files deleted?
