The cost to businesses and insurers of a single global ransomware attack could hit $193 billion, according to a 2019 report from a group that includes Lloyd's of London. (Photo: Fotolia)

(Bloomberg Markets) — By the time Deb Dellapena arrived for work at Merck & Co.'s 90-acre campus north of Philadelphia, there was a handwritten sign on the door: The computers are down.

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