alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32.Crypt.nc Checkin"; flow:established,to_server; http.uri; content:".php?l"; content:"&rvz1="; fast_pattern; content:"&rvz2="; pcre:"/&rvz1=\d+&rvz2=\d+?$/"; http.header_names; to_lowercase; content:!"|0d 0a|accept|0d 0a|"; classtype:command-and-control; sid:2008567; rev:9; metadata:created_at 2010_07_30, signature_severity Major, updated_at 2024_04_27;)