alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT DRIVEBY Nuclear EK SilverLight 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; http.header_names; to_lowercase; content:"|0d 0a|x-powered-by|0d 0a|"; file.data; content:"PK"; within:2; content:"AppManifest.xaml"; classtype:exploit-kit; sid:2020317; rev:9; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Any, attack_target Client_Endpoint, created_at 2015_01_27, deployment Perimeter, malware_family Nuclear, confidence High, signature_severity Critical, tag DriveBy, tag Exploit_Kit, tag Nuclear, updated_at 2024_04_27;)