Invitation Email Scam
Now the hackers were in his computer, using his Gmail same message was sent to everyone on his Address Book, many of them were discontinued email addresses resulting in mass rejections with errors. Once back, he saw these errors and realized something is wrong so immediately disconnected it from the internet and brought it to us.
We found the stealthy remote access service and some auto delete filters in his email account which would not allow him to know of any warnings/alerts from various banking agencies or warning messages from people on his address book, keeping him totally unaware of what's happening with his finances. Now any transactions done from his computer related to banking, Shopping etc will not flag any fraud possibility with the related sites and will go through without any hiccups and due to filters created, he will not get any emails/alerts regarding them.
So be careful of clicking any links, downloading any attachments in email or calling the number received in email regarding fake invoice from Norton, McAfee, Geek Squad, Apple or iCloud as they are mostly scams.