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The FBI is warning businesses of DoppelPaymer ransomware attacks and a change in tactics among operators, who are now cold-calling victims to pressure them into paying the ransom.

These attacks have disrupted the provision of healthcare, emergency, and education services for people around the world, officials say. They point to one September 2020 incident in which the ransomware hit a German hospital; another attack in the same month compromised a county’s emergency call center and blocked officials from accessing a computer-aided dispatch system…