A spokesperson for Kaseya told FOX Business on Monday that less than 60 of its customers had been affected, but between 800 and 1,500 of those companies' customers may have been reached.

A spokesperson for Huntress Labs, the cybersecurity firm that is working with companies in response to the attack, told FOX Business that it is tracking more than 30 managed service providers across the U.S., European Union, Australia and Latin America where the tool was used to target "well over 1,000 businesses."

Experts at Huntress said they "strongly" believe the ransomware attack was spearheaded by REvil/Sodinikibi. REvil is the group that was named as responsible for another massive attack on critical U.S. infrastructure earlier this year.

The team at Kaseya has said they have been able to replicate the attack vector and are working on distributing a patch. The company also said they are working with the FBI.

President Biden over the weekend said it wasn't yet clear whether the Russians were behind the attack, but he noted that he warned Russian President Vladimir Putin the U.S. would respond appropriately when necessary.

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He added that he was unable to "say where and under what circumstances. Only tomorrow will there be more information." He added that rescuers were planning to use a helicopter to access the site where the plane had crashed.

The Soviet-era twin-engine turboprop plane had taken off from the city of Petropavlovsk-Kamchatsky, the regional capital of the Kamchatka Peninsula, over 6,700km (4,163 miles) east of Moscow. It had been due to land at a runway in the town of Palana, but, according to the Ministry of Emergency Situations, it crashed several kilometers from the airport.

A source in the emergency services shed light on the circumstances after the discovery of the crash site. "The wreckage of the plane was found near the village of Palana. Before the crash, it collided with a hill, which led to the destruction of the plane," the source told TASS.

According to Khrabrov, the plane was flown by "a good young crew with experience." In the cockpit, he said, was "a fairly experienced commander - 35 years old." In 2012, an Antonov-28 similar to the one rescuers were searching for on Tuesday, and flying the same route, crashed into a forest in Kamchatka. Investigators said both pilots were intoxicated when the accident happened.

The Kamchatka Region is vast, larger in size than Ukraine or France, and is home to just 300,000 people. With a rocky landscape marked by no fewer than 16 active volcanoes, it splits the Pacific Ocean on one side from the Sea of Okhotsk on the other.