Washington, D.C. (U.S.), Dec 20 (ANI): The United States has publicly blamed North Korea for unleashing the so-called ‘WannaCry’ cyber attack. The so-called cyber attack crippled hospitals, banks and other companies across the globe earlier this year. “After careful investigation the United States is publicly attributing the massive WannaCry cyber attack to North Korea," Homeland Security Advisor to President Donald Trump, Tom Bossert, said. "North Korea has acted especially badly, largely unchecked, for more than a decade, and its malicious behavior is growing more egregious," he added. Bossert added that Facebook Inc and Microsoft Corp acted last week to disable a number of North Korean cyber actions.