alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT RIG Exploit URI Struct March 20 2015"; flow:established,to_server; urilen:>220; flowbits:set,ET.RIGEKExploit; http.uri; content:"/index.php?"; depth:11; content:"=l3S"; fast_pattern; offset:26; depth:4; pcre:"/^\/index\.php\?[A-Za-z0-9_-]{15}=l3S/"; http.header; content:"/?"; content:"=l3S"; classtype:exploit-kit; sid:2020721; rev:4; metadata:created_at 2015_03_21, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_30;)