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These are the most feared hacker groups in the world

Paul Szoldra,Paul Szoldra,Paul SzoldraJul 22, 2016, 00:07 IST

Jon Woo/Reuters

The most feared hacker groups are what cybersecurity professionals refer to as "advanced persistent threat" actors.

Unlike your average hacker breaching a server for curiosity or activism, or criminal gangs armed with ransomware and interested only in money, APTs backed by nation-states usually are among the very best.

And most of the time, they are interested in just one thing: Stealing secrets.

Well, that, and not getting caught.