alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32.Trojan.Agent.U3D7V0 Checkin"; flow:established, to_server; http.method; content:"GET"; http.uri; content:"/getc"; content:"/?c="; fast_pattern; pcre:"/^\/getc(?:loud|onf)\/\?c=/i"; http.header_names; content:!"User-Agent|0d 0a|"; content:!"Referer|0d 0a|"; reference:md5,97572a7a0690ba1643525bf6666b74c6; classtype:command-and-control; sid:2018530; rev:5; metadata:created_at 2014_06_05, signature_severity Major, updated_at 2020_09_24;)