Ransomware Disrupts Keio Business Systems; Tokyo Metro Reports 59,000 Email Addresses Exposed

Summary

Keio confirmed a ransomware attack disrupted some business systems, with train operations unaffected; it is investigating possible data access. Separately, Tokyo Metro said attackers accessed systems containing 59,000 member email addresses.

Key points

• Keio confirmed a ransomware attack on its servers after a system failure and shut down its network to limit further damage.
• The disruption appears limited to Keio’s hospitality business; train operations were not affected. Local media reported payment-system disruptions.
• Keio is investigating the attack’s route and impact, including whether customer or business-partner information was accessed; it reported the incident to police.
• No ransomware group had claimed responsibility for the Keio attack at the time of publication.
• Separately, Tokyo Metro disclosed unauthorized access to systems containing 59,000 member email addresses; it said those were the only data in the affected systems.
• Tokyo Metro said it identified and closed the security weakness used in the incident. Whether the two events were connected is unclear.

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