If you were hacked on the same host again, just simply change your host, restore a back-up and change every single password, from the FTP account to the cPanel a/c EVERYTHING. Also might want to check your access logs and ensure you're running a patched version of vBulletin and also a poorly coded plugin might be causing this aswell. How many plugins do you have?
Edit; And no I don't know about that image and it doesn't really matter anyways.
Edit; Keep an eye on this blog posts of Wayne Luke;
https://www.vbulletin.com/forum/entr...Forums-(Part-1)