I'm not sure what can be done nowadays. In the past you would say, format disks and go back to a backup before the threatening event happened. But nowadays all our stuff is in the cloud and you can only go back to the state from 10 minutes ago, and all our disks are flash drives that you can't fully format as an end user. Maybe you can just accept that some virusses will always be there and act accordingly.
Would be nice to have a tool that everyone on the planet could use to run against those backups and find a common source of the infections, along with an idea of when it was found in the wild.
