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GMO Internet tells Onamae.com customers to disconnect PCs after breach

Original title: Japan’s GMO Internet Urges Customers to Disconnect PCs

Infosecurity Magazineby Phil Muncaster ()2 min read1
Part of a story covered by 8 sourcesGMO refuses ransom after Onamae trading-desktop breachMerged summary & timeline
AI summary · x-ai/grok-4.7Summaries by Vani AI

As many as 26,739 servers may be affected; GMO refused a ransom of about 8 billion yen and has not found ransomware on devices checked so far.

GMO Internet suspended its Onamae.com virtual desktop service on October 21 after finding malicious programs in some customer server environments the day before. An alert said information may have been accessed and up to 26,739 servers may be affected. Attackers demanded about eight billion yen ($50.7m) and, after GMO refused, said they would deploy ransomware at noon on October 27. GMO told customers to scan, back up, disconnect and power off PCs, and to ship machines for analysis. As of 11:59 on October 27, no malware, including ransomware, had been found on devices already examined.

Unconfirmed: Unauthorized trading is only suggested by some reports, and ransomware has not been found on analyzed devices.

Key facts
  • Onamae.com is a virtual desktop service used by foreign-exchange traders.
  • The ransom demand was about eight billion yen, or $50.7 million.
  • GMO says analysis is ongoing and not every customer device has been checked.
  • Some reports suggest trading accounts were used for unauthorized transactions.
Security assessment · AI, from the article

Impact: Malicious programs on customer servers; possible data and account access

ProductAffected
GMO Internet Onamae.com—
What to do
  1. 1.Run a full virus scan, back up data, then disconnect the PC and turn it off.
  2. 2.Ship the PC to GMO Internet so its security team can investigate.
Analyze this story with Vani AIImpact, who is affected and what defenders should do, in a new chat

From the original article

2 min read at infosecurity-magazine.com

GMO Internet has told customers to unplug their PCs in advance of a possible ransomware attack

Infosecurity Magazine

By Phil Muncaster · infosecurity-magazine.com

Read the full article at Infosecurity Magazine

A short excerpt; the article and its images belong to the publisher. Summary, key facts and assessment above are AI-written from the article and can be wrong.