alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT DRIVEBY Nuclear EK SWF M2"; flow:established,to_client; flowbits:set,et.Nuclear.Payload; http.content_type; bsize:24; content:"application/octet-stream"; http.server; content:"nginx"; startswith; http.header; content:"|20|inline|3b 20|filename="; fast_pattern; pcre:"/Content-Disposition\x3a\x20inline\x3b\x20filename=(?:[a-z0-9]{4})?\r\n/"; file.data; content:"ZWS"; within:3; classtype:exploit-kit; sid:2020311; rev:12; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Any, attack_target Client_Endpoint, created_at 2015_01_26, deployment Perimeter, malware_family Nuclear, confidence High, signature_severity Critical, tag DriveBy, tag Exploit_Kit, tag Nuclear, updated_at 2024_03_04;)