alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT SPL2 EK SilverLight"; flow:to_server,established; content:".html?sv="; http_uri; fast_pattern:only; pcre:"/\.html\?sv=[1-5](\,\d+?){1,3}$/U"; classtype:exploit-kit; sid:2017848; rev:2; metadata:created_at 2013_12_13, confidence High, signature_severity Major, updated_at 2019_07_26;)