Not surprising, but outrageous nonetheless.

North Korea was behind the massive “WannaCry” cyberattack in May that spread around the world costing billions of dollars, White House Homeland Security Adviser Tom Bossert announced in a Wall Street Journal op-ed Monday.

In the article, entitled, “It’s Official: North Korea Is Behind WannaCry,” Bossert wrote that the Hermit Kingdom was the main culprit behind the May 2017 global cyberattack in which computers running Windows were targeted. During the infamous attack, data were encrypted and ransom payment, in the form of bitcoin, was demanded of users if they wanted their data back.

“Cybersecurity isn’t easy, but simple principles still apply. Accountability is one, cooperation another,” Bossert’s op-ed read. “They are the cornerstones of security and resilience in any society. In furtherance of both, and after careful investigation, the U.S. today publicly attributes the massive ‘WannaCry’ cyber attack to North Korea.”