alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT Nuclear SilverLight URI Struct (noalert)"; flow:established,to_server; flowbits:set,et.Nuclear.SilverLight; flowbits:noalert; http.uri; content:"/14"; fast_pattern; pcre:"/\/14\d{8}(?:\.xap)?$/"; classtype:exploit-kit; sid:2019668; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2014_11_07, deployment Perimeter, malware_family Nuclear, signature_severity Critical, tag Exploit_Kit, tag Nuclear, updated_at 2020_09_27;)