alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Fluxer CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/gate.php?id="; fast_pattern; content:"&ver="; distance:0; content:"&m="; distance:0; pcre:"/&m=\d$/i"; http.user_agent; bsize:7; content:"Mozilla"; http.connection; bsize:5; content:"Close"; http.header_names; to_lowercase; content:!"|0d 0a|accept-"; content:!"|0d 0a|referer|0d 0a|"; reference:md5,648f432b41f3bcebc1a599f529055cf0; classtype:command-and-control; sid:2022492; rev:6; metadata:created_at 2016_02_05, malware_family Win32_Fluxer, signature_severity Major, updated_at 2024_04_30;)