A group of Russian government-backed hackers gained access to important U.S. government and defense industry computers, according to a report from Reuters They’ve done so by using a method of infiltration and communication that involved online photo data and social media site Twitter Inc TWTR 0.74%.

Cybersecurity company FireEye Inc FEYE 0.46%, which has been investigating the Russian group, has discovered that the hackers used stenographic tweets to convey instructions to previously infected computers.

Tweeting In Code

FireEye says that the hackers created algorithms that checked different Twitter accounts every day looking for specific messages. Russian agents would then access these Twitter accounts and tweet coded messages that contained hidden instructions for the computers running the algorithms.

How It Worked

According to FireEye, the tweets would…

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