alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT NullHole EK Exploit URI Struct"; flow:established,to_server; urilen:>34; http.uri; content:"/"; offset:33; depth:1; pcre:"/^\/[a-f0-9]{32}\/(?=[a-z]*?[A-Z])(?=[A-Z]*?[a-z])[A-Za-z]+\.(?:html|jar|swf)$/"; http.cookie; content:"nhweb="; fast_pattern; startswith; classtype:exploit-kit; sid:2019727; rev:3; metadata:created_at 2014_11_18, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_18;)