IDCF Cloud hit by ransomware attack amid rising cyber incidents in Japan

A surge in cyberattacks and security incidents has been reported among Japanese organizations in October 2026. A significant breach occurred on October 7, 2026, involving SoftBank Group’s ‘IDCF Cloud,’ where the service infrastructure fell victim to a ransomware attack.

The incident affected all customers utilizing specific data centers, though some were able to restore data from backups. This event coincided with a broader trend of numerous organizations announcing unauthorized access and information leakage incidents, prompting warnings from various institutions regarding the necessity of immediate security audits and improved log utilization.