Nippon Columbia Group: malware on a Daiichikosho contractor's PC

One employee PC at Nippon Columbia Group, which processed personal data for Daiichikosho, was infected with malware. About 8.724 million records of Big Echo and DK Dining members and of employees may have leaked; no passwords were included.

Disclosed

2026-10-08

Organizations involved

Leaked or at risk

8.7M

8,724,000

Downtime

Unknown

Timeline

[Breached]

[Breached]

[Through a supplier][Critical]Tokyo, MinatoPersonal services and entertainment8,724,000 leaked
Daiichikosho Co., Ltd.
[Breached][Critical]Tokyo, ShibuyaInformation and communications
Nippon Columbia Group Co., Ltd.

						Note
Daiichikosho Co., Ltd.	[Through a supplier]	[Critical]	Tokyo, Minato	Personal services and entertainment	8,724,000
Nippon Columbia Group Co., Ltd.	[Breached]	[Critical]	Tokyo, Shibuya	Information and communications	Unknown