alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Murlo Trojan Checkin"; flow:to_server,established; http.method; content:"GET"; nocase; http.uri; content:".asp?mac="; nocase; pcre:"/^[a-f0-9]/Ri"; content:"&ver="; nocase; content:"&os="; nocase; classtype:command-and-control; sid:2009442; rev:11; metadata:created_at 2010_07_30, signature_severity Major, updated_at 2020_04_22;)