alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT Nuclear EK Landing Jan 14 2014"; flow:established,from_server; file_data; content:"|3c 68 74 6d 6c 3e 0d 0a 3c 68 65 61 64 3e 3c 73 63 72 69 70 74 3e 2f 2a|"; within:24; fast_pattern; content:"|24 2c|"; distance:0; pcre:"/^\s*?(?P<var1>[^\x29]+)\x29[^\n]*?=\s*?(?P=var1)\s*?\x7c{2}\s*?\d+?\s*?\x2c/R"; classtype:exploit-kit; sid:2020180; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2015_01_14, deployment Perimeter, malware_family Nuclear, confidence High, signature_severity Critical, tag Exploit_Kit, tag Nuclear, updated_at 2022_03_17;)