My WordPress site got hacked, almost certainly over Christmas. As far as I can tell, no files were changed, and no users were added, but the sql database had the blog name changed to:
(4, 'blogname', 'Hacked by walangkaji - The Crows Crew', 'yes'),
A search for 'Hacked by walangkaji' shows quite a lot of sites with this same hacked title; I can't tell how many of them are running WP. There is also a hackers message board where walangkaji boasts about his exploits.
I have taken backups of everything and taken the site down completely, but I want to get it up again within a day or two. How do I find out how this was done and prevent repeats?