alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32.Crypt.nc Checkin"; flow:to_server,established; http.uri; content:".php?l"; content:"&rvz1="; fast_pattern; content:"&rvz2="; pcre:"/&rvz1=\d+&rvz2=\d+?$/"; http.header_names; content:!"Accept|0d 0a|"; classtype:command-and-control; sid:2008567; rev:7; metadata:created_at 2010_07_30, signature_severity Major, updated_at 2020_09_24;)