alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT Possible Astrum EK URI Struct"; flow:established,to_server; urilen:60<>100; http.request_line; content:"|2e 20|HTTP/1."; fast_pattern; http.uri; pcre:"/^\/(?=[A-Za-z_-]*?\d)(?=[a-z0-9_-]*?[A-Z])(?:[A-Za-z0-9_-]{4}){15,}(?:[[A-Za-z0-9_-]{2}\x2e?\x2e|[A-Za-z0-9_-]{3}\x2e)$/"; classtype:exploit-kit; sid:2019176; rev:5; metadata:created_at 2014_09_16, confidence Medium, signature_severity Major, updated_at 2020_12_10;)