I doubt it's a specific attack on bareboats BVI. It's a typical virus attack where your server got infected and the virus is trying to spread itself via your address book. You probably should isolate the system from the internet until you get a IT guy in to clean everything. Any personal data for you or customers may have been compromised. That is the usual point of this type of attack. Sad world we live in where you have people who do this kind of garbage.