washington-postAfter Sony Pictures Entertainment was hacked shortly before Thanksgiving of 2014, the attackers – who dubbed themselves the “Guardians of Peace” – went quiet.

Or so it seemed.

But now researchers say they’ve linked the attackers – whom the U.S. government has said were directed by North Korea — to a chameleon-like group active since at least 2009 and still on the digital warpath, attacking systems in South Korea and elsewhere in Asia.

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