ET WEB_CLIENT Hex Obfuscation of String.fromCharCode % Encoding

Query · suricata

flow:established,to_client;
content:"%53%74%72%69%6e%67%2e%66%72%6f%6d%43%68%61%72%43%6f%64%65"; nocase; fast_pattern;
Raw source ET WEB_CLIENT Hex Obfuscation of String.fromCharCode % Encoding · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (
    msg:"ET WEB_CLIENT Hex Obfuscation of String.fromCharCode % Encoding";
    flow:established,to_client;
    content:"%53%74%72%69%6e%67%2e%66%72%6f%6d%43%68%61%72%43%6f%64%65"; nocase; fast_pattern;
    reference:url,cansecwest.com/slides07/csw07-nazario.pdf;
    reference:url,www.sophos.com/security/technical-papers/malware_with_your_mocha.html;
    classtype:bad-unknown;
    sid:2012041; rev:2;
    metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2010_12_11, deployment Perimeter, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_07_26;
)

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