alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT SPL2 EK SilverLight"; flow:established,to_server; http.uri; content:".html?sv="; fast_pattern; pcre:"/\.html\?sv=[1-5](\,\d+?){1,3}$/"; classtype:exploit-kit; sid:2017848; rev:4; metadata:created_at 2013_12_13, confidence High, signature_severity Major, updated_at 2024_03_19;)