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

Oriental Diamond: ransomware attack

On 4 May, a ransomware attack encrypted data on the head office file server of diamond and jewelry company Oriental Diamond, stopping work. Names, addresses and phone numbers it holds may have leaked; bank details, card data and My Number were not included. It said it will stop using the VPN the attackers came in through.

Disclosed

2026-05-12

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

Timeline

  1. Detected 2026-05-04
  2. Disclosed 2026-05-12
  3. 8 days

Attack or cause

Method
[Ransomware]
Impact
[Data leak][Service outage]
Entry point
VPN device

Data exposed or at risk

[Name][Postal address][Phone number]

Organizations involved

Open in organization search

Sources

  1. [1][Official]不正アクセスによるシステム障害および個人情報流出の可能性に関するお詫びとお知らせOriental Diamond · 2026-05-12