alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT Possible Spartan/Nuclear EK Payload"; flow:established,from_server; http.server; content:"nginx"; startswith; http.header; content:"Accept-Ranges|3a 20|bytes|0d 0a|Content-Disposition|3a 20|inline|3b 20|filename=|0d 0a|"; fast_pattern; pcre:"/\x20filename=\r\n(?:\r\n)?$/"; http.content_type; content:"application/octet-stream"; startswith; classtype:exploit-kit; sid:2022135; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2015_11_24, deployment Perimeter, malware_family Nuclear, confidence Medium, signature_severity Critical, tag Exploit_Kit, tag Nuclear, updated_at 2020_06_09;)