alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT Evil Redirector Leading to EK Mar 19 2015"; flow:established,to_server; content:"GET"; http_method; content:"4c2H"; nocase; http_uri; pcre:"/\/\??4c2H(?:$|[&?]utm_source=)/U"; classtype:exploit-kit; sid:2020715; rev:4; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2015_03_20, deployment Perimeter, confidence High, signature_severity Major, tag Redirector, updated_at 2019_07_26;)