> JapanHacked_
[Contained][Severity: Critical][Ransomware]

Sanshodo: ransomware attack

An intrusion and ransomware were identified early on May 15, prompting server shutdowns and network isolation. Ordering and logistics were affected. The May 22 update described gradual recovery and continued investigation of personal data, with no confirmed external leakage or published count or fields. The June 13 findings confirmed compromised accounts and encryption but no direct traces of customer or partner data exfiltration. Affected servers were disconnected and backups restored in a separate operational environment.

Disclosed

2025-05-15

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

Timeline

  1. Detected, Disclosed 2025-05-15
  2. 1 days

Attack or cause

Method
[Ransomware]
Impact
[Service outage]
Entry point
Unknown

Data exposed or at risk

–

Organizations involved

Open in organization search

Sources

  1. [1][Official]弊社ネットワークへの不正アクセスに関するお知らせSanshodo Inc. · 2025-05-15
  2. [2][Official]不正アクセス被害の対応状況についてSanshodo Inc. · 2025-05-22
  3. [3][Official]弊社ネットワークへの不正アクセスに関する調査結果のご報告Sanshodo · 2025-06-13