alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT Underminer EK SWF Request"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/"; content:".swf"; distance:26; within:4; endswith; pcre:"/\/(?![a-z]{26}|[0-9]{26})[a-z0-9]{26}\.swf$/i"; http.header; content:"/"; content:".html"; distance:26; within:5; content:"x-flash-version|3a 20|"; http.referer; pcre:"/^.+(?![a-z]{26}|[0-9]{26})[a-z0-9]{26}\.html$/i"; http.cookie; content:"token="; depth:6; fast_pattern; pcre:"/^[a-f0-9]{32}$/Ri"; classtype:exploit-kit; sid:2026426; rev:3; metadata:affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2018_09_28, deployment Perimeter, confidence High, signature_severity Major, tag Underminer_EK, updated_at 2020_09_16;)