YCC Information Systems (Yamagata City) has published the results of an external investigation into a cyberattack that occurred in April.

The attack is believed to have been caused by the attacker obtaining or guessing authentication credentials to infiltrate the internal network. There is a possibility that personal information of those who participated in the “New School Enrollment Congratulations Event” hosted from 1998 to 2001 may have been leaked externally, but no personal information leakage has been confirmed at this time. The company states that it will continue to monitor the internet and implement security measures. Currently, no leakage of personal information of those who participated in the “New School Enrollment Congratulations Event” hosted from 1998 to 2001 has been confirmed, but please be cautious of suspicious phone calls. Notices regarding this matter have been mailed to the affected individuals.

Inquiries regarding this matter are accepted by the Advertising Department (023-622-5274, weekdays 10:00 AM to 5:00 PM).

New School Enrollment Congratulations Event

The “New School Enrollment Congratulations Event” is not a specific historical or cultural site, but rather a celebratory gathering commonly held in many countries, particularly in East Asia, to honor students who have been accepted into a new school. These events often include ceremonies, gifts, and communal meals to mark the transition and express pride in the student’s achievement. While not tied to a single location, they reflect deep cultural values placed on education and family support.