IDC Frontier, a Japanese cloud and data center company and a SoftBank Group subsidiary, says its IDCF Cloud service was hit by a ransomware attack that began at 3:40 AM local time on October 7. The company’s announcement states that the disruption in East Japan Region 1 was caused by a ransomware attack by a third party, and that the investigation into the cause and scope is continuing. The outage affects 495 companies and local governments that rent virtual servers, storage and networking from the platform.
IDC Frontier shut down and isolated the affected systems and has proactively disabled customer access to the management consoles for all regions while it checks their security. BleepingComputer reports that customers saw a message from the attacker before being locked out, claiming it took seven minutes to breach the region and that it encrypted 225 databases (3.6 PB), reached 239 hypervisors, sealed 16,000 VM disks and wiped 554,153 snapshots. Those figures are the attacker’s claims, not confirmed by the company.
Marine products company Nissui said its logistics subsidiary suffered a system outage tied to suspected unauthorized access at a third-party data center, halting shipments and receipts. It is unclear whether this is connected to the IDCF Cloud attack. BleepingComputer also cites Macnica data showing 119 Japanese incidents involving personal data theft or exposure so far this year, 83 of them between July 1 and October 6, versus 84 in all of 2025.