> JapanHacked_
[Resolved][Severity: Major][Ransomware]

Uchiyama Holdings: ransomware attack

Anomalies detected March 7 were disclosed March 9. The April 20 report confirmed removal of intruders and restoration of normal systems. Some employee information may have leaked and staff were notified; customer or business-partner leakage was not confirmed. Data identification and monitoring continued, without a published count. Customer services continued without interruption.

Disclosed

2026-03-09

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

Timeline

  1. Detected 2026-03-07
  2. Disclosed 2026-03-09
  3. 2 days

Attack or cause

Method
[Ransomware]
Impact
[Data leak]
Entry point
Unknown

Data exposed or at risk

[Employment]

Organizations involved

Open in organization search

Sources

  1. [1][Official]サイバーセキュリティインシデントに関するお知らせUchiyama Holdings Co., Ltd. · 2026-03-09
  2. [2][Official]サイバーセキュリティインシデントに関するお知らせ【第3報】Uchiyama Holdings Co., Ltd. · 2026-04-20