alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT Possible Spartan/Nuclear EK Payload"; flow:established,from_server; http.header; content:"nginx"; content:"X-Powered-By|3a|"; content:"application/octet-stream"; content:"Content-Disposition|3a 20|inline|3b 20|filename=|0d 0a|"; fast_pattern; classtype:exploit-kit; sid:2021765; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2015_09_14, deployment Perimeter, malware_family Nuclear, confidence Medium, signature_severity Critical, tag Exploit_Kit, tag Nuclear, updated_at 2020_06_01;)