alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win64/Havex Checkin"; flow:established,to_server; http.uri; content:".php?id="; fast_pattern; pcre:"/^\d{30}\w{6}-\d{2}-\d{3}-\d{9}$/R"; http.header_names; content:!"Referer"; reference:url,blog.trendmicro.com/trendlabs-security-intelligence/64-bit-version-of-havex-spotted/; classtype:command-and-control; sid:2020083; rev:4; metadata:created_at 2014_12_30, malware_family Win64_Havex, signature_severity Major, updated_at 2020_08_20;)