alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT Nuclear EK CVE-2013-2551 IE Exploit URI Struct"; flow:established,to_server; content:".tpl"; http_uri; fast_pattern; pcre:"/\/1[34]\d{8}\.tpl$/U"; flowbits:set,et.exploitkitlanding; classtype:exploit-kit; sid:2017601; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2013_10_17, deployment Perimeter, malware_family Nuclear, confidence High, signature_severity Critical, tag Exploit_Kit, tag Nuclear, tag CISA_KEV, updated_at 2019_10_08;)