Severity: HighAction: Be aware

Japan's GMO urges customers to shut down PCs amid ransomware threat

The GMO Group has urged customers to disconnect their systems from the internet and shut down computers after a threat actor who breached the company's Onamae Desktop Cloud threatened to launch a ransomware attack today.

Excerpt from the primary source: BleepingComputer

Who is affected

Small businesses · Security professionals

What you should do · Be aware

No immediate action is indicated. Share this with the relevant teams and watch for updates.

Automated guidance based on this story's classification. Check the linked advisories for specifics.

Sources

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Original reporting

Japan's GMO urges customers to shut down PCs amid ransomware threat BleepingComputer · bleepingcomputer.com · Oct 27, 2026 · Primary source
Severity: HighAction: Be aware

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