alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Generic HeapSpray Construct"; flow:established,from_server; file_data; content:"createElement(|22|div|22|)"; fast_pattern; content:"for("; pcre:"/^\s*?(?P<var>[^\x3d\x3b\)\s]+)\s*?=\s*?0\s*?\x3b(?P=var)\s*?\<\s*?(?:0x)?\d{3,4}\s*?\x3b\s*?(?P=var)\+\+\s*?\)\s*?\x7b[^\x7d]+?\[\s*?(?P=var)\s*?\]\s*?=\s*?document\.createElement\([\x22]div[\x22]\)[^\x7d]+?\[\s*?(?P=var)\s*?\]/Rsi"; classtype:trojan-activity; sid:2018299; rev:4; metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2014_03_20, deployment Perimeter, confidence Medium, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_10_08;)