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Japan's Onamae Desktop Cloud hacked, up to 27,000 servers affected

GMO said the breach may have exposed customer data and trading credentials, while attackers demanded about $50 million and threatened daily leaks.

  • On Tuesday, GMO Internet Group urged customers to disconnect their computers after hackers threatened a noon ransomware attack and began leaking data allegedly stolen in a cyberattack.
  • The security breach, disclosed last week, potentially affected more than 26,000 servers used by over 70 securities firms and businesses in Japan and overseas.
  • GMO refused the attackers' $1m ransom demand, saying there was no guarantee stolen data would be deleted, and announced a 5,000 Japanese Yen goodwill payment for affected users.
  • Prime Minister Sanae Takaichi convened an emergency meeting and requested a new cybersecurity package by next week, calling the situation "serious" with growing concerns about civil damages.
  • GMO CEO Masatoshi Kumagai wrote in a Sunday blog post that "the internet itself is now on the verge of breaking down," urging public-private cooperation to protect Japan.
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52 Articles

Lean Left

GMO Internet Group announced on the 29th that it has obtained valuable information that could lead to the identification of attackers in a cyberattack on its cloud services. According to the announcement, the company's white-hat hacker team…

·Tokyo, Japan
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Lean Right

Hacker believed to be behind recently discovered unauthorized access incident announced customer information after company failed to respond to ransom demand

·Ankara, Türkiye
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BleepingComputer broke the news in Melville, United States on Wednesday, October 21, 2026.
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