alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT Evil Redirector Leading to EK Feb 05 2016"; flow:established,to_server; http.uri; content:"/?keyword="; fast_pattern; pcre:"/\/\?keyword=(?:(?=[a-f]{0,31}[0-9])(?=[0-9]{0,31}[a-f])[a-f0-9]{32}|\d{5})$/"; classtype:exploit-kit; sid:2022493; rev:4; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2016_02_06, deployment Perimeter, confidence High, signature_severity Major, tag Redirector, updated_at 2020_10_05;)