http://www.vbulletin.com/forum/blogs...ve-been-hacked
http://www.vbulletin.com/forum/blogs...vbulletin-site
I would do the following, to ensure everything is clean.
First you need to follow our advisory about deleting the install folder off your forums.
Then please read the following two blog posts:
http://www.vbulletin.com/forum/blogs...ve-been-hacked
http://www.vbulletin.com/forum/blogs...vbulletin-site
Also please see these recent security announcements:
vBulletin 4.1.x-4.2.x & All versions of vBulletin 5:
http://www.vbulletin.com/forum/forum...-1-vbulletin-5
vBulletin 5.0.x patch released, for a different security issue:
http://www.vbulletin.com/forum/forum...d-all-versions