Analytics Spam - Filtering By Domain Extension

Hi,

I was managing to keep on top of Analytics spam but it seems to have taken to another level now. Its like swatting a fly away and three more come back and it's getting to the point where I am constantly fighting these pests.

I opened this thread to see if anyone anyone has any advice that will help fight a better fight against Analytics referral spam.

I am looking for a way of filtering referrals by domain extension, so I am looking at filtering .info domains, .xyz domains, etc. I have looked online and cannot really find a lot of information or if it can be done, which is why I came here. I tried setting up an Analytics filter to exclude .info in referrals but they still manage to get through.

Any ideas/advice would be welcome :)
TD