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China-linked APT group targets Russian nuclear sub designer with an undocumented backdoor

A threat actor believed to be operating on behalf of Chinese state-sponsored interests was recently observed targeting a Russian defense contractor involved in designing nuclear submarines for the Russian Navy, according to new research published today by Cybereason. The attack was narrowly-focused, the firm said, and originated with a spear-phishing attempt targeting a general director working at the Rubin Design Bureau, a Saint Petersburg-based shipbuilder that has designed most of Russia‚Äôs nuclear submarines…