alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET WEB_CLIENT Possible Hex Obfuscation Usage On Webpage"; flow:established,to_client; content:"|5C|x"; nocase; content:"|5C|x"; nocase; distance:2; within:2; content:"|5C|x"; nocase; distance:2; within:2; content:"|5C|x"; nocase; distance:2; within:2; content:"|5C|x"; nocase; distance:2; within:2; pcre:"/\x5Cx[a-f,0-9]{2}\x5Cx[a-f,0-9]{2}\x5Cx[a-f,0-9]{2}\x5Cx[a-f,0-9]{2}\x5Cx[a-f,0-9]{2}/i"; reference:url,www.sophos.com/security/technical-papers/malware_with_your_mocha.html; reference:url,cansecwest.com/slides07/csw07-nazario.pdf; classtype:bad-unknown; sid:2012119; rev:3; metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2010_12_30, deployment Perimeter, confidence Medium, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_07_26;)