Thegentlemen claim to have compromised Nostrum Corporation (nostrum.co.jp) in Japan, encrypting systems and threatening to leak data as part of a ransomware operation. Nostrum, founded in 1991 and represented by Ryoichi Jono, is a Japanese technology company involved in smartphone app development, web system development, and website construction, cited in the claim as the affected party.
#Japan
#Japan
Incident Details
- Victim: Nostrum
- Sector: Not Found
- Country: JP
- Actor: thegentlemen
- Source:
- Discovered: 2026-05-06T10:08:41.895526+00:00
- Published: 2026-04-27T11:09:00+00:00
Information
- Nostrum Corporation (nostrum.co.jp) — based in Japan, founded in 1991
- Specializes in smartphone app development, web system development, and website construction
- Representative: Ryoichi Jono
- Registered and verified on the J-GoodTech platform as a Japanese technology business
- Flagship product: job aptitude test preparation tool — a simulation platform replicating SPI, TG-WEB, and similar employment exam interfaces used by major Japanese companies
- Ransomware actor involved: thegentlemen
Disclaimer: This post is based on public claims made by the ransomware group "thegentlemen". I cannot confirm the accuracy of the information. However, I would be happy to share any official statement from the affected organization to provide clarification.