2024 Kyuhen (Kyuden affiliate) ransomware — up to ~374k customer records potentially exposed
Data compromised
Names, addresses, phone numbers in public-impact summaries
Technical writeup
English-language summaries of June 2024 reporting describe ransomware against Kyuhen Co., Ltd., a Kyushu Electric Power/Kyuden-linked affiliate handling retail-electricity workflows, with encryption of customer-facing systems and up to ~374,000 personal records cited as potentially caught up in disclosure notices.
Root cause
Ransomware impacting affiliate IT serving electricity retail operations