alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT CritXPack Landing Pattern"; flow:established,to_server; http.uri; content:"/i.php?token="; fast_pattern; nocase; pcre:"/\/i.php?token=[a-z0-9]+$/i"; classtype:exploit-kit; sid:2015998; rev:5; metadata:created_at 2012_12_08, signature_severity Major, updated_at 2020_09_18;)