En cours d’enquête

YCC Information Systems: entrusted partner data may have leaked after file-server ransomware

Ransomware on the file server was confirmed early on April 2, 2026 (first notice April 3). The April 14 fourth notice said entrusted partner data may have leaked; the May 20 fifth notice found no clear outbound traces but did not fully rule out access.

Dernière mise à jour: 2026-11-09

Ce contenu est affiché en English.

Présentation

No published count (count blank). Network-device admin credentials were likely guessed or obtained. Multiple Yamagata municipalities and firms published victim-side notices.

Chronologie

2026-04-02Survenue
2026-04-02Découverte
2026-04-03Divulgation

Réponse de l’organisation

Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.

Que faire ?

Be wary of emails, SMS or calls impersonating the organisation; do not open links or attachments or enter passwords or card details. Change reused passwords on other services.

Sources

【重要】ランサムウェア攻撃に関するお知らせ（第四報）株式会社YCC情報システム · 2026-11-09
【重要】当社サーバーへの不正アクセスに関するご報告株式会社YCC情報システム · 2026-11-09
【重要】ランサムウェア攻撃に関するお知らせ（第三報）株式会社YCC情報システム · 2026-11-09
【重要】ランサムウェア攻撃に関するお知らせ（第五報）株式会社YCC情報システム · 2026-11-09
【重要】ランサムウェア攻撃に関するお知らせ（第二報）株式会社YCC情報システム · 2026-11-09

YCC Information Systems: entrusted partner data may have leaked after file-server ransomware

Présentation

Chronologie

Réponse de l’organisation

Que faire ?

Sources

Informations associées

Aucune information publiée

Commentaires et réponses

Écrire un commentaire