alert tcp $HOME_NET !21:23 -> $EXTERNAL_NET any (msg:"ET WEB_SERVER Insomnia Shell Outbound CMD Banner"; flow:to_server,established; content:"Shell enroute......."; depth:20; content:"Microsoft Windows "; content:"Copyright |28|c|29| 20"; distance:0; content:"Microsoft Corp"; distance:0; reference:url,www.insomniasec.com/releases; classtype:trojan-activity; sid:2019900; rev:1; metadata:created_at 2014_12_09, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)