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Ryomo Systems: VPN ransomware intrusion may have exposed business-partner and customer personal data

VPN account abuse on Aug 12, 2026; detected Aug 14; ransomware confirmed. Third notice (Sep) reports intrusion traces on some servers and possible leakage of partner/customer/employee personal data; counts still under review. First public notices were Aug 15 and 19 (this source is the third notice stating those dates).

Last updated: 2026-11-09

Overview

Counts still under review → blank.

Timeline

  1. Occurred
  2. Discovered
  3. Disclosed

Organization response

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

What you can do

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

  1. 当社社内システムへの不正アクセスに関するお知らせ（第3報）株式会社両毛システムズ · 2026-11-09

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