The time zone thing listed on their site says Tallinn, Estonia.

Here's the site the hacker's challenge page linked to: http://www.timeanddate.com/worldclock/city.html?n=242

EDIT: I just checked their IP (213.219.122.11) and it resolves back to Tallinn as well, so that's the actual city they're hosted at.

LAST EDIT, I SWEAR: On a whim, I also traced the defacer's challenge site (200.222.209.203) and that one fell back to Brazil, city of Petrópolis. However, this is a very different result than I got from the IP locator here at AntiOnline, which said they were in Australia. So feel free to check it with your own tools, see which one yours agree with. I used the one at http://www.geobytes.com/IpLocator.htm

And now, I sleep.