alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT Nuclear EK Landing Jan 06 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; pcre:"/^(?=[A-Z0-9]*?[a-z])(?=[a-z0-9]*?[A-Z])[A-Za-z0-9]+\x2a\x2f[^\n]*?Function\s*?\x28\s*?[\x22\x27](?P<var1>[^\x22\x27]+)[\x22\x27]\s*,\s*[\x22\x27]if\s*?\x28\s*?(?P=var1)\s*[=!]{2}\s*?[\x27\x22][\x22\x27]\s*?\x29\s*?\{/Rs"; classtype:exploit-kit; sid:2020103; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2015_01_07, deployment Perimeter, malware_family Nuclear, confidence High, signature_severity Critical, tag Exploit_Kit, tag Nuclear, updated_at 2022_03_17;)