Google Product Forums
Re: All pages on my website keep being replaced by Goole's homepage. Eg: http://84f6a4eef61784b33e4acbd32c8fdd72.com/go.php?
Malware & hacked sites
I think people have found their way here as the only discussion ongoing (via Google search) for this problem - that's certainly how I arrived here.
Right now the .htaccess files are arriving faster than I can delete them and I still can't figure out where they're coming from.