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; content:"Mozilla"; bsize:7; http.connection; content:"Close"; bsize:5; http.header_names; content:!"Accept-"; content:!"|0d 0a|Referer|0d 0a|"; reference:md5,648f432b41f3bcebc1a599f529055cf0; classtype:command-and-control; sid:2022492; rev:4; metadata:created_at 2016_02_05, malware_family Win32_Fluxer, signature_severity Major, updated_at 2023_03_10;)