Park Jin Hyok is a North Korean programmer and hacker. He is best known for his alleged involvement in some of the costliest computer intrusions in history. Park is on the FBI's wanted list. North Korea denies his existence.
The United States Department of Justice has charged Park and other members of the Lazarus group for the WannaCry ransomware attack of 2017, which involved the spreading of ransomware that encrypted files on victims' computers after spreading itself to other vulnerable devices on the local network that the compromised computer could access. It would then request ransom payments be made in the form of cryptocurrency in exchange for decryption keys allowing victims to recover their files. The attack affected countless numbers of businesses and organizations throughout the world, including in one incident infecting the United Kingdom's NHS, where nonfunctional computer systems led to thousands of appointments being canceled.