alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/DelfInject.A CnC Checkin 2"; flow:established,to_server; http.uri; content:"/gate.php?username="; content:"&country="; content:"&OS="; reference:md5,d8c2f31493692895c45d620723e9a8c3; classtype:command-and-control; sid:2014164; rev:3; metadata:created_at 2012_01_28, signature_severity Major, updated_at 2020_04_21;)