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The recent attack on Greece’s largest natural gas transmission operator DESFA by ransomware gang Ragnar Locker is the latest on a growing list of incidents where ransomware groups attacked energy companies. This gang seems to prefer critical infrastructure sectors, having targeted over 50 such organizations in the U.S. over the past two years.

According to a new analysis by researchers from Cybereason, Ragnar Locker is a growing threat that uses layers of encryption to hide instructions in its binary and kills various processes associated with remote login and support.

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