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The defense sector in Ukraine and Eastern Europe has been targeted by a novel .NET-based backdoor called DeliveryCheck (aka CAPIBAR or GAMEDAY) that’s capable of delivering next-stage payloads.

The Microsoft threat intelligence team, in collaboration with the Computer Emergency Response Team of Ukraine (CERT-UA), attributed the attacks to a Russian nation-state actor known as Turla, which is also tracked under the names Iron Hunter, Secret Blizzard (formerly Krypton), Uroburos, Venomous Bear, and Waterbug. It’s linked to Russia’s Federal Security Service (FSB).

“DeliveryCheck is distributed via email as documents with malicious macros,” the company said in a series of tweets. “It persists via a scheduled task that downloads and launches it in memory. It also contacts a C2 server to retrieve tasks, which can include the launch of arbitrary payloads embedded in XSLT stylesheets.”

images from Hacker News