Ransomware attack on IDCF Cloud hits 495 Japanese firms and agencies

In the early hours of October 7, 2026, parts of IDCF Cloud, operated by SoftBank subsidiary IDC Frontier, went offline after a ransomware attack. The company said 495 contracted organizations were affected, including the Ibaraki Prefectural government and police, whose websites were still down on October 8.

• Attack began around 3:40 AM on October 7; data center servers lost power by 4:00 AM
• IDC Frontier confirmed ransomware and reported 495 affected organizations
• Ibaraki Prefecture and police sites returned 503 errors on October 8
• Affected users include Nissui Logistics, Six Apart, Soliton, UD Talk and Fibergate