alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Downloader.Win32.Geral Checkin"; flow:established,to_server; http.uri; content:".asp?MAC="; nocase; fast_pattern; content:"&ver="; nocase; pcre:"/\.asp\?MAC=[A-F0-9]{2}-[A-F0-9]{2}-[A-F0-9]{2}-[A-F0-9]{2}-[A-F0-9]{2}-[A-F0-9]{2}&VER=[^&]+$/i"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:md5,f01260fff3d6fb705fc8afaa3ea54564; classtype:command-and-control; sid:2018201; rev:5; metadata:created_at 2014_03_04, signature_severity Major, updated_at 2024_04_21;)