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A Colorado company that specializes in providing IT services to dental offices suffered a ransomware attack this week that is disrupting operations for more than 100 dentistry practices, KrebsOnSecurity has learned. Multiple sources affected say their IT provider, Englewood, Colo. based Complete Technology Solutions (CTS), was hacked, allowing a potent strain of ransomware known as "Sodinokibi" or "rEvil" to be installed on computers at more than 100 dentistry businesses that rely on the company for a range of services — including network security, data backup and voice-over-IP phone service. Reached via phone Friday evening, CTS President Herb Miner declined to answer questions about the incident. When asked about reports of a ransomware attack on his company, Miner simply said it was not a good time and hung up. The attack on CTS comes little more than two months after Sodinokibi hit Wisconsin-based dental IT provider PerCSoft, an intrusion that encrypted files for approximately 400 dental practices. Thomas Terronez, CEO of Iowa-based Medix Dental, said he's heard from several affected practices that the attackers are demanding $700,000 in bitcoin from some of the larger victims to receive a key that can unlock files encrypted by the ransomware. Others reported a ransom demand in the tens of thousands of dollars. In previous ransomware attacks, the assailants appear to have priced their ransom demands based on the number of workstation and/or server endpoints within the…

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