Hiroike Gakuen: ransomware after an intrusion in March; student and parent data at risk

On 30 August 2024 Hiroike Gakuen (Kashiwa, Chiba), which runs Reitaku Kindergarten, Reitaku Junior and Senior High School and Reitaku University, said its information systems had been hit by ransomware on 27 August. According to its investigation report of 14 March 2025, the attacker broke into its servers on 20 March 2024, and several suspicious connections in August left traces of a possible leak. Ransomware was run early on 27 August, encrypting files on servers and PCs and making the systems unusable. Names, birth dates, addresses, phone numbers, email addresses, enrolment records and more of current and former pupils and students, their parents, staff, former staff and business partners may have leaked. No publication on the dark web or misuse has been found.