alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET WEB_CLIENT Hex Obfuscation of document.write % Encoding"; flow:established,to_client; content:"%64%6f%63%75%6d%65%6e%74%2e%77%72%69%74%65"; 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:2012059; rev:2; metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2010_12_15, deployment Perimeter, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_07_26;)