A previously unknown Microsoft Office vulnerability was recently used to deliver spyware to Russian-speaking targets, in a possible case of cyberespionage.

Security firm FireEye noticed the intrusion attempt, which taps a critical software flaw that hackers are using to craft malicious Microsoft Word documents.

On Wednesday, FireEye said it uncovered one attack that weaponized a Russian military training manual. Once opened, the malicious document will deliver FinSpy, a surveillance software that’s been marketed to governments.

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