First thing I would do is protect yourself or your company (if that's the case). You will earn some brownie points with the bosses plus your making sure your not getting caught by this.
Then I would do as Polynomial said and submit it to Google. I don't think you should bother emailing the registrar as the chances are they have no clue by now. Leave the hard work to the big companies.
I would also consider sending an email to a big anti virus company. Rather than taking this on yourself leave them do there job. Submit a sample or the link to a one of the big companies. They know exactly what needs doing as they get paid to do so. If your AV didn't notice it then the chances are it hasn't got a signature and others are at risk. Ideally I would download a copy of the virus (up to you though! Could easily infect your machine / network).
If you think you have been infected you can follow some basic guidance from Microsoft or do some google searching.