alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT RIG Landing URI Struct March 20 2015"; flow:established,to_server; http.uri; content:"/?"; depth:2; content:"=l3S"; fast_pattern; offset:17; depth:4; pcre:"/^\/\?[A-Za-z0-9_-]{15}=l3S/"; classtype:exploit-kit; sid:2020722; rev:4; metadata:created_at 2015_03_21, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_01;)