Russian government hackers tried to trick Ukrainian and international volunteers into using a malicious Android app disguised as an app to launch Distributed Denial of Service (DDoS) attacks against Russian sites, according to new research published by Google on Tuesday.

Since the beginning of the Russian invasion, Ukraine has resisted not only on the ground, but also online. A loose collective of technologists and hackers has organized under an umbrella quasi-hacktivist organization called the IT Army, and they have launched constant and persistent cyberattacks against Russian websites.

The Russian government tried to turn this volunteer effort around to unmask Ukrainian hackers, in a smart, but ultimately failed attempt.

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“This is interesting and new, and [Russian government hackers] sort of testing the boundaries again, and trying to explore different things. The Russian groups definitely keep us on our toes,” Shane Huntley, the head of the Google research team Threat Analysis Group, told Motherboard in a phone call.

Read more: VICE