alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT NullHole URI Struct Jul 22 2015 M2"; flow:established,to_server; urilen:40; content:"/e.html"; http_uri; offset:33; depth:7; pcre:"/^\/[a-f0-9]{32}\/e\.html$/U"; classtype:exploit-kit; sid:2021507; rev:2; metadata:created_at 2015_07_22, signature_severity Major, updated_at 2019_07_26;)