alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT Styx Landing Page Oct 25 2013"; flow:established,from_server; file_data; content:"fromCharCode"; content:"+0+0+3-1-1"; fast_pattern; within:100; content:"substr"; content:"(3-1)"; within:100; flowbits:set,et.exploitkitlanding; classtype:exploit-kit; sid:2017635; rev:4; metadata:created_at 2013_10_25, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)