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Nostrum

thegentlemen

This record tracks a ransomware attack claimed by the thegentlemen group against Nostrum. It collects the publicly disclosed attack details — sector, location and timeline — as published on the operator's leak site and indexed by Breach House.

Country
Japan
Business Category
Retail / E-commerce
Employees
0-50
Discovered
2026-05-06
Published
April 27, 2026
Victim ID
LJIL3ugDs1Ud

Attack Summary

nostrum.co.jp Nostrum Corporation, based in Japan, was founded in 1991 and specializes in smartphone app development, web system development, and website construction. The company is represented by Ryoichi Jono and is registered on the J-GoodTech platform as a verified Japanese technology business. One of their flagship self-developed products is a job aptitude test preparation tool — a simulation platform replicating real SPI, TG-WEB, and similar employment exam interfaces used by major Japanese companies

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