alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT Evil Redirector Leading to EK March 16 2015"; flow:established,to_server; urilen:51<>61; content:"/a"; http_uri; depth:2; pcre:"/^\/a[a-z]{9,}\/[a-f0-9]{40}$/U"; pcre:"/^GET \/(?P<name>a[a-z]{9,})\/.+?\r\nHost\x3a\x20(?P=name)\./sm"; classtype:exploit-kit; sid:2020698; rev:2; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2015_03_16, deployment Perimeter, confidence High, signature_severity Major, tag Redirector, updated_at 2019_07_26;)