alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT Fiesta EK Landing Apr 23 2015"; flow:established,from_server; file_data; content:"=window|3b|"; fast_pattern; content:"String.fromCharCode"; content:"|28 2f|Win64|3b 2f|i,"; nocase; content:"function"; pcre:"/^\s*?[^\x28\s]*?\x28\s*?(?P<a1>[^\s,\x29]+)\s*?,\s*?(?P<a2>[^\s,\x29]+)\s*?\x29\{[^\r\n]*?[\+=]String.fromCharCode\((?P=a2)\)[^\r\n]*?\}/Rs"; classtype:exploit-kit; sid:2020979; rev:4; metadata:created_at 2015_04_23, confidence High, signature_severity Major, updated_at 2019_10_08;)