ET WEB_CLIENT Generic HeapSpray Construct

Query · suricata

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";
Raw source ET WEB_CLIENT Generic HeapSpray Construct · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
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;
)

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