Ransomware attack disrupts Japan's IDCF Cloud used by govt clients
Ransomware attack hits Japan's IDCF Cloud, impacting government clients and causing data center outages.
IDC Frontier's IDCF Cloud service in Japan was hit by a ransomware attack, leading to an outage in its East Japan Region 1 data center cluster. The attack, which began on October 7, forced a shutdown of affected systems, impacting 495 companies and local governments. The threat actor claims to have encrypted 3.6 PB of data and compromised numerous virtual machines and snapshots.
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The lesson from this incident
Full lessonA ransomware attack on IDC Frontier's IDCF Cloud service demonstrates the catastrophic downstream impact when a managed cloud provider is compromised — a single breach cascades to hundreds of government and enterprise clients simultaneously. The encryption of 3.6 petabytes of data, including virtual machines and snapshots, suggests that backup and recovery mechanisms were either insufficient, improperly isolated, or were themselves within the blast radius of the attack. This matters because cloud-hosted snapshots are only a resilience tool if they are stored in immutable, air-gapped environments that ransomware cannot reach. Government clients face additional risk as disrupted services can affect public safety, administrative continuity, and citizen data. Incidents of this scale underscore that shared infrastructure creates shared risk, requiring both providers and tenants to maintain independent recovery postures.
What helps against this
How we list vendors- Network segmentation and microsegmentation
One compromised machine can no longer reach everything else.
- Immutable backup and recovery
Ransomware cannot delete or encrypt your way back.
- Incident response retainer
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