"Our product has 100 percent efficacy," new CEO Jon Loew said. "We hope it remains that way."

"We have not seen this scale of attack, the aggressiveness and penetration, in the U.S. before," one researcher said.

Security giant Symantec has bought Israeli start-up FireGlass for an undisclosed sum, saying the browser isolation technology the small company has developed is the future of internet security and will soon become ubiquitous.

Under the plan, it will become mandatory for any computer that is imported or produced within the Eurasian Economic Union to carry anti-virus software that is made by a country within the group.

An apparent outbreak of Petya ransomware appears to be affecting a large number of banks, energy firms and other companies based in Russia, Ukraine, Spain, Britain and France.

An absurdly small number of companies affected by ransomware reported the incidents to the feds last year, newly released FBI data shows.