alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT Nuclear EK Payload URI Struct Nov 05 2013"; flow:established,to_server; content:"/f/"; http_uri; depth:3; pcre:"/^\/f(?:\/[^\x2f]+)?\/14\d{8}(?:\/\d{9,10})?(?:\/\d)+(?:\/x[a-f0-9]+(?:\x3b\d)+?)?$/U"; classtype:exploit-kit; sid:2017667; rev:8; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2013_11_05, deployment Perimeter, malware_family Nuclear, confidence High, signature_severity Critical, tag Exploit_Kit, tag Nuclear, updated_at 2019_07_26;)