They already got me.
Thought I had the best anti virus!
Anti-virus can't stop the attack. The attacking software connects directly to the vulnerable service and all that anti-virus does is stop execution of downloaded malware, clicking on attachments, etc. The only way to stop the attack is to stop incoming connections with a firewall. Windows firewall will do it, either stopping all incoming connections or just port 139 which has the vulnerability. You can also turn off SMB v1 compatability which stops it. Or apply the patch. I never patch so I have to do one of the other things to stop it.