Casio Confirms Security Breach, Employee and Customer Data Leaked

Electronics manufacturer Casio has disclosed a ransomware attack in October 2024 that led to the online leakage of personal data belonging to employees, customers, and business partners. The breach also exposed internal business information, including invoices, partner communications, meeting materials, and internal system data.

Casio stated it refused to meet the attackers’ ransom demands and identified the Underground ransomware group as responsible. The group claimed to have exfiltrated 204.9 GB of data. Casio has not revealed any details about the identity of the perpetrators.

Personal Data Leaked by Attackers

A total of 6456 Casio employees, including temporary staff, have had their personal data leaked online.

This includes:

• Human resources data such as name, employee number, email address, and affiliation for 5509 domestic employees
• In addition to the above, family names, addresses and phone numbers for 97 domestic employees, and ID card information such as gender and date of birth for 10 employees
• Names, e-mail addresses, and HQ system account information on 881 local employees of domestic and overseas Group companies
• Names, taxpayer ID numbers and human resources information for 66 ex-employees of some overseas group companies that were previously affiliated with the company

Personal details of 1931 individuals from Casio business partners have also been included in the leak.

This includes:

• Names, e-mail addresses, telephone numbers, company names, company address of 1922 contact persons or representative of Casio business partners, including overseas
• Names, email addresses, phone numbers, addresses, and biographical information of 9 people who have interviewed for employment with Casio in the past

For Further reference

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