alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT Fiesta EK SilverLight Exploit Apr 23 2015"; flow:established,to_client; http.response_header; header_lowercase; content:"content-disposition|3a 20|inline|3b|"; startswith; content:".xap"; endswith; pcre:"/^content-disposition\x3a\x20[^\r\n]+filename=[a-z]{5,8}\d{2,3}\.xap$/"; file.data; content:"AppManifest.xaml"; fast_pattern; classtype:exploit-kit; sid:2020982; rev:7; metadata:created_at 2015_04_23, confidence High, signature_severity Major, updated_at 2024_04_28;)