This forum was hit with a "Google Redirect" hack that injects malicious code into the database that causes Google searches to be redirected to spammy sites. A good explanation of the problem and its solution is found here:

https://club.myce.com/t/vbulletin-my...ve-them/304794

I was able to find and delete the malicious code that was injected. I have since locked things down so it should not happen again.

I also have made the site secure with SSL.