alert http $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET WEB_CLIENT Possible String.FromCharCode Javascript Obfuscation Attempt"; flow:established,to_client; file.data; content:"String.FromCharCode("; fast_pattern; nocase; pcre:"/String\x2EFromCharCode\x28[0-9]{1,3}/i"; reference:url,www.w3schools.com/jsref/jsref_fromCharCode.asp; reference:url,www.roseindia.net/javascript/method-fromcharcode.shtml; reference:url,isc.sans.org/diary.html?storyid=7906; reference:url,isc.sans.org/diary.html?storyid=7903; classtype:bad-unknown; sid:2011347; rev:3; metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2010_09_28, deployment Perimeter, confidence Medium, signature_severity Major, tag Web_Client_Attacks, updated_at 2024_04_09;)