alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Generic Trojan Checkin (double Content-Type headers)"; flow:established,to_server; http.method; content:"POST"; nocase; http.uri; content:".php"; http.content_type; content:"text/html"; content:"image/gif"; http.header_names; content:"|0d 0a|Content-Type|0d 0a|"; content:"|0d 0a|Content-type|0d 0a|"; fast_pattern; classtype:command-and-control; sid:2010282; rev:9; metadata:created_at 2010_07_30, confidence Medium, signature_severity Major, updated_at 2024_02_13;)