alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT Nuclear EK Payload URI Struct Oct 5 2014"; flow:established,to_client; flowbits:isset,et.Nuclear.Payload; http.response_header; header_lowercase; content:"content-disposition|3a 20|"; startswith; content:".exe"; fast_pattern; pcre:"/^content-disposition\x3a.+?filename\s*?=\s*?[\x22\x27]?\d\.exe/"; classtype:exploit-kit; sid:2019359; rev:13; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2014_10_06, deployment Perimeter, malware_family Nuclear, confidence High, signature_severity Critical, tag Exploit_Kit, tag Nuclear, updated_at 2024_04_27;)