alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SmokeLoader Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; nocase; http.header; content:"|0d 0a|Content-Type|3a 20|application/x-www-form-urlencoded|0d 0a 0d 0a|"; fast_pattern; http.user_agent; content:"|20|MSIE|20|"; http.request_body; pcre:"/^\d+$/"; http.header_names; content:"|0d 0a|User-Agent|0d 0a|"; depth:14; content:!"Referer"; classtype:command-and-control; sid:2017261; rev:7; metadata:created_at 2013_08_01, signature_severity Major, updated_at 2020_11_05;)