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Ransomware Attack Disrupts SoftBank Subsidiary's Cloud Services

Ransomware Attack Disrupts SoftBank Subsidiary's Cloud Services

First seen 8 Oct 2026, 02:29 UTC • •
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ThreatCluster AI
ThreatCluster •October 8, 2026 at 03:31 UTC
  • •IDC Frontier's cloud service was disrupted by a ransomware attack affecting 495 customers.
  • •The attack caused significant service outages, including inaccessible websites for government and corporate clients.
  • •The company has halted operations to investigate and mitigate further risks.

IDC Frontier Inc., a subsidiary of SoftBank Corp., reported a ransomware cyberattack that disrupted its cloud services on October 7, 2026. The attack affected 495 corporate and municipal customers, rendering their websites inaccessible. The disruption began around 3:40 a.m. JST, prompting the company to shut down its IDCF Cloud service to prevent further damage and data leaks. Affected entities include major companies like Nissui Corp., which faced shipment issues due to the attack. IDC Frontier is currently investigating the authenticity of images circulating on social media that allegedly show a statement from the attackers. The company has apologized for the inconvenience and is working to restore services safely.

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Timeline

2026-10-07
Ransomware attack reported
IDC Frontier Inc. announced a ransomware attack disrupting its cloud services, affecting 495 customers.
Mainichi.Jp

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Common questions

Who is affected by the attack?
The attack has impacted 495 corporate and municipal customers, including Nissui Corp and local government websites.
What is the current status of the cloud service?
IDC Frontier has shut down the IDCF Cloud service to prevent further damage and is working to restore it safely.
Is there any information about the attackers?
Images claiming to show a statement from the attackers have circulated, but IDC Frontier is investigating their authenticity.