The boss of the company at the heart of a widespread hack that has affected hundreds of businesses stated that he briefed the White House and that attackers are demanding a single $70 million ransomware payment.

The cyberattack that started to uncover on Friday is considered to have hit hundreds of mainly small and medium-sized businesses and tens of thousands of computers. It quickly set off alarms in the US national security circles over concern that it could have far-reaching effects.

On Monday, Fred Voccola, the chief executive of Kaseya Ltd., whose software was targeted in the attack, spoke with Deputy National Security Advisor Anne Neuberger regarding the event while the company was still scrabbling to restore services to its clients, Mr. Voccola stated that Mr. Voccola told the White House that Kaseya wasn’t aware of any critical infrastructure that had been hit by the ransomware or of any victims related to national security, he stated in an interview on Monday.

The hackers behind the ransomware attack stated that, upon payment, they will release a “universal decryptor” that would unlock computers that had been encrypted and rendered unusable by the attack, according to a note posted on the group’s website on Sunday.