Moved to vB4 General Discussion. I would guess that you overlooked something the first time around... a plugin was still present, the datastore table had a plugin within... a shell script on your server... any number of things honestly be sure to check using these links and be VERY THOROUGH grab a cup of coffee, do it right and above all else do not become frustrated that is the #1 thing many do and assume that since it started working after they uploaded files that its fine, no you need to be very in-depth after being hacked not only for your safety but for the safety of all your community members.
http://www.vbulletin.com/forum/blogs...vbulletin-site
http://www.vbulletin.com/forum/blogs...ve-been-hacked
http://www.vbulletin.com/forum/blogs...vbulletin-site