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Investigating

Omikenshi: employee personal data may have been exfiltrated after ransomware

Possible data leak: After a late March 16, 2026 intrusion that halted core systems and encrypted servers, an April 13 filing said some outbound transfers were seen, limited to employee-type fields without customer PII.

Last updated: 2026-11-09

Overview

No published count (count blank). Customer PII stated not included.

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. サイバー攻撃によるシステム障害に関するご報告オーミケンシ株式会社 · 2026-11-09
  2. （開示事項の経過）サイバー攻撃によるシステム障害についてのお知らせオーミケンシ株式会社 · 2026-11-09

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