“The WannaCry ransomware attack has affected more than 200,000 computers in over 150 nations. The attack, which targets the Microsoft Windows operating system, has been described as one of the largest cyberattacks of all time. The malware encrypts files, demanding users of affected computers pay a ransom of $300 in bitcoin. The software behind WannaCry was reportedly stolen in April from the National Security Agency.Cyberattacks come in different forms, so while the WannaCry attack may be one of the largest of its kind, a number of others have affected more customers. Those numbers have reached into the tens, and even hundreds, of millions.”

These are 15 of the most famous cyberattacks of all time.