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Over the past few months, geopolitical tensions have escalated as Russia amassed tens of thousands of troops along Ukraine’s border and made subtle but far-reaching threats if Ukraine and NATO don’t agree to Kremlin demands.

Now, a similar dispute is playing out in cyber arenas, as unknown hackers late last week defaced scores of Ukrainian government websites and left a cryptic warning to Ukrainian citizens who attempted to receive services.

Be afraid and expect the worst

“All data on the computer is being destroyed, it is impossible to recover it,” said a message, written in Ukrainian, Russian, and Polish, that appeared late last week on at least some of the infected systems. “All information about you has become public, be afraid and expect the worst.”

Around the same time, Microsoft wrote in a post over the weekend, “destructive” malware with the ability to permanently destroy computers and all data stored on them began appearing on the networks at dozens of government, nonprofit, and information technology organizations, all based in Ukraine. The malware—which Microsoft is calling Whispergate—masquerades as ransomware and demands $10,000 in bitcoin for data to be restored.

But Whispergate lacks the means to distribute decryption keys and provide technical support to victims, traits that are found in virtually all working ransomware deployed in the wild. It also overwrites the master boot record—a part of the hard drive that starts the operating system during bootup.

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“Overwriting the MBR is atypical for cybercriminal ransomware,” members of the Microsoft Threat Intelligence Center wrote in Saturday’s post. “In reality, the ransomware note is a ruse and that the malware destructs MBR and the contents of the files it targets. There are