[TheLastSuperman]

Originally Posted by z3r0

Check for a new plugin added named "vbulletin" in the hook location "init_startup" containing a load of base64 encoded stuff, if it's there you have been hacked and you should disable/remove it and have a check for any files uploaded to your forum (left menu -> maintenance -> diagnostics -> suspect file versions)

Actually, it's best to check the datastore table, (Edit: well truth be told check regular plugins via admincp, the plugin table as well PLUS the datastore table, check them all!) then look in the pluginlist (there are two, pluginlist and pluginlistadmin so be sure to check both, typically malicious cade is only in pluginlist though) because code added to the bottom of this will not show in one single/particular "plugin" via the admincp because this contains all the plugins in one list not a single view per say . You can also scroll the entire contents of pluginlist to see a complete list of plugins installed on your site, be careful if editing out malicious code and once done go to your admincp then into plugin manager and save the active status (to reset datastore/plugins) otherwise changes may not show immediately and/or could cause display issues.

What some have been doing is injecting their base64 code at the very bottom (scroll to find, they add tons of white space so you won't notice right off the bat unless you scroll down, i.e. if a scrollbar exist when viewing via phpmyadmin, scroll scroll scroll ) and more so we see this with myfilestore than any other type of exploit (also if you're dealing with that in particular, myfilestore redirect then also check the file datastore_cache.php which is located in /includes/datastore/ for any mal code).