alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET MALWARE Night Dragon CMD Shell"; flow:established,to_server; content:"|68 57 24 13 00 33|Microsoft"; offset:12; depth:15; reference:url,www.mcafee.com/us/resources/white-papers/wp-global-energy-cyberattacks-Night-dragon.pdf; classtype:trojan-activity; sid:2012307; rev:1; metadata:created_at 2011_02_11, confidence Medium, signature_severity Major, updated_at 2019_07_26;)