The next black swan?

I've been thinking for a while that one day we're going to see a cyber-attack like this on a large scale, and our ATMs won't work, the internet will come to a standstill, and normal daily activity will come to a halt because everything runs online now.  To me it seems like more of a "when", not "if" scenario - and I worry I might get financially wiped out when it happens - but I guess I just hope the world will have too much at stake to destroy the economy that way.