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ColdRecon / Breach Radar / Daiichi Kosho
Breach Record

Daiichi Kosho

DISCLOSED 2026-10-08 · MALWARE · 8,720,000 RECORDS EXPOSED

Japanese karaoke operator Daiichi Kosho announced a data breach affecting approximately 8.72 million customer and employee records. The incident was discovered after malware was found on a computer belonging to its outsourcing partner, Nippon Columbia Group. The breach was disclosed on October 8, 2026.

The record

What we know

Disclosed
2026-10-08
Attack vector
Malware
Sector
Entertainment
Country
Japan
Records exposed
8,720,000
Data classes exposed
personal information
ENDPOINT INVOLVED
ColdRecon assessment

Could a positive-security control have prevented this?

Verdict · unclear · opinion

It is unclear whether a positive-security model would have prevented this breach because the text does not specify how the malware was introduced or whether it involved unauthorized changes that an allowlist would block.

Our assessments are opinion, grounded in the cited public facts. Read them critically.

Sources

Cited reporting

Similar vector · recent

Other malware breaches on file

This page is the permanent ColdRecon entry for the Daiichi Kosho disclosure. It updates if new public reporting emerges. All tracked breaches →

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