How big was the attack? You can't fool all the people all the time. But fooling all their targets for even 30 minutes is a significant achievement considering w

How big was the attack? You can't fool all the people all the time. But fooling all their targets for even 30 minutes is a significant achievement considering what info they could have obtained. What do we know about the victims? What reason do we have for believing it was a random victim attack? Besides the insane difficulty part..