U.S. blames North Korea for 'WannaCry' cyber attack

FILE PHOTO: A screenshot shows a WannaCry ransomware demand, provided by cyber security firm Symantec, in Mountain View, California, U.S. May 15, 2017. Courtesy of Symantec/Handout via REUTERS

WASHINGTON (Reuters) - The Trump administration has publicly blamed North Korea for unleashing the so-called WannaCry cyber attack that crippled hospitals, banks and other companies across the globe earlier this year.

"The attack was widespread and cost billions, and North Korea is directly responsible," Tom Bossert, homeland security adviser to President Donald Trump, wrote in a piece published on Monday night in the Wall Street Journal.