Internet attacked (2002) (9/10)

A hacking attack attempted to infect the whole internet system with all its 13 DNS root servers in 2002. This DDoS attack lasted for only 60 minutes, however, it was the scale of this attack that was alarming. It was the largest and most complex cyber attack according to US Federal services.

The Melissa virus (1999) (8/10)

Credit Card Details Hack (2009) (10/10)