KADOKAWA: ransomware attack on Niconico and other group services

Ransomware hit the group's data center on 8 June 2024, disrupting Niconico and other services. BlackSuit claimed responsibility. Dwango's 5 August findings presume that employee account data was stolen through phishing or a similar attack, while saying the exact route and method remained unknown. It confirmed leakage of personal data on 254,241 people, including business contacts, creators, employees, and students and families of Kadokawa Dwango Educational Institute. Fields include names, birth dates, addresses, phones, email, educational backgrounds, bank details, and personnel and student data. Leakage of Niconico users' login credentials and card data was not confirmed. Niconico video reopened on 5 August after 58 days; that does not establish full recovery of the entire group.