alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT Likely Evil JS used in Unknown EK Landing"; flow:established,from_server; file_data; content:"base64decode"; nocase; content:"xxtea_decrypt"; nocase; fast_pattern; content:"long2str"; nocase; content:"str2long"; nocase; classtype:exploit-kit; sid:2021218; rev:4; metadata:created_at 2015_06_09, confidence Medium, signature_severity Major, updated_at 2019_10_08;)