U.S. Secretary of State Mike Pompeo said the massive cyberattack discovered this week was "pretty clearly" done by Russians.
"[T]here was a significant effort to use a piece of third-party software to essentially embed code inside of U.S. Government systems and now it appears systems of private companies and companies and governments across the world as well," Pompeo said. "This was a very significant effort, and I think it's the case that now we can say pretty clearly that it was the Russians that engaged in this activity."
President Trump has not publicly commented about the breach. Russian President Vladimir Putin denies his country is responsible for the attack.
🔦 One U.S. official called it "the worst hacking case in the history of America."
Officials at the Department of Energy and National Nuclear Security Administration said hackers accessed their networks. The U.S. Treasury, Commerce, and Federal Regulatory Commission were also breached in the attack.
"At this point, the investigation has found that the malware has been isolated to business networks only, and has not impacted the mission essential national security functions of the department, including the National Nuclear Security Administration," said spokesperson Shaylyn Hynes for the Department of Energy. "When DOE identified vulnerable software, immediate action was taken to mitigate the risk, and all software identified as being vulnerable to this attack was disconnected from the DOE network."