Looking for the Suggested Anti-spyware

I was looking for the name of the suggested anti-spyware that blizzard suggests, if anyone can help me out with that please and thank you. I had it before but had to reformat my computer a while back.

A few people in my guild have been hacked, my guild master as of an hour ago, even had an authenticator...enough to make me move my toosh and take measures to protect my own account. Thanks