alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Hex Obfuscation of substr % Encoding"; flow:established,to_client; content:"%73%75%62%73%74%72"; nocase; 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:2012269; rev:4; metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2011_02_03, deployment Perimeter, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_09_27;)