A cyberespionage group operating out of Russia has launched malware attacks against the Ukrainian government and at least one U.S.-based organization through a previously unknown vulnerability that affects most versions of Windows.

The group, which has been dubbed the Sandworm team, has been actively attacking organizations like the NATO alliance, energy firms and telecommunication companies since 2013, but its latest campaign leveraging the new Windows zero-day flaw was identified in late August by researchers from security firm iSight Partners.

The company made some of its findings public early Tuesday in coordination with Microsoft, which plans to release a patch for the vulnerability later in the day.

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