The global cyber war · Companies and supply chains

Japanese rail and hotel group Keio confirms a ransomware attack on its group servers

Reported1 distinct origin, 0 independent.

Keio Corporation said it confirmed a ransomware attack on its group's servers in the early hours of 26 September, shut down its network and reported the incident to police, BleepingComputer reported. Some business systems were disrupted, and a Keio Plaza Hotel Tokyo notice warned of possible delays to customer-facing services. BleepingComputer said the incident appeared to affect only the hospitality side, not train operations; Keio named no attacker.

When
26 September 2026
Where
Japan, Japan
What
cyber, company
Attribution
Not attributed. Keio named no attacker.
In the record
Published 2026-11-09 22:52 UTC · backfilled

Sources

  1. Evidence BleepingComputer Media · Not yet classified origin: Keio Corporation statement, 26 Sep · published 2026-09-28 00:00 UTC In the early hours of September 26, 2026, we confirmed a ransomware attack on our group's servers.

History

Cite or reuse

The War Record, "Japanese rail and hotel group Keio confirms a ransomware attack on its group servers", record ev-20261109-g546, version 1, https://thewarrecord.com/events/ev-20261109-g546/

This month's events as JSON (id ev-20261109-g546) · CC BY 4.0