White House blames North Korea for 'WannaCry' cyberattack

The White House has officially blamed North Korea for the "WannaCry" cyberattack earlier this year.

"After careful investigation, the U.S. today publicly attributes the massive 'WannaCry' cyberattack to North Korea,"White House homeland security adviser Tom Bossert said. "The attack was widespread and cost billions, and North Korea is directly responsible."

WannaCry was a ransomware attack in May that targeted the Microsoft Windows operating system.

Read more from CNN.