alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Linux/BillGates Checkin Response"; flow:established,from_server; dsize:20; content:"|08 00 00 00 0c 00 00 00 00 00 00 00 00 00 00 00 e8 fd 00 00|"; reference:md5,b4dd0283c73d0b288e7322b95df0cb1b; classtype:command-and-control; sid:2019208; rev:1; metadata:created_at 2014_09_22, confidence High, signature_severity Major, updated_at 2019_07_26;)