alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT FlimKit Landing Applet Jul 05 2013"; flow:established,to_client; file_data; content:"<applet "; nocase; fast_pattern; content:"|3b|document.write("; nocase; pcre:"/^[^\x3b]+?\+[a-z]+?\.substring([^)]+?)[^\x3b]+?\+[a-z]+?\.substring([^)]+?)[^\x3b]+?\+[a-z]+?\.substring([^)]+?)/Rsi"; classtype:exploit-kit; sid:2017106; rev:4; metadata:created_at 2013_07_05, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_10_08;)