alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET RETIRED Night Dragon CnC Traffic Outbound 2"; flow:established,to_server; dsize:16; content:"|68 57 24 13|"; offset:12; depth:4; threshold:type limit, count 1, seconds 60, track by_dst; reference:url,www.mcafee.com/us/resources/white-papers/wp-global-energy-cyberattacks-Night-dragon.pdf; classtype:command-and-control; sid:2012306; rev:7; metadata:created_at 2011_02_10, former_category MALWARE, signature_severity Major, updated_at 2024_12_03;)