IDC Frontier Ransomware: One Cloud, 495 Customers

IDC Frontier ransomware attack on a Japanese cloud provider affecting 495 customers, October 2026

One ransomware attack on one cloud region has hit 495 companies and local governments in Japan at once. IDC Frontier, a SoftBank subsidiary, said its IDCF Cloud service was struck by ransomware on October 7 at 3:40 a.m. local time, forcing it to shut down the network and systems of its East Japan Region 1.…

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