alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT GondadEK Landing Sept 03 2013"; flow:established,from_server; file_data; content:"expires=|22|+expires.toGMTString()"; fast_pattern; nocase; content:"51yes.com/click.aspx?"; nocase; content:"|22|gb2312|22|"; nocase; content:"delete "; nocase; content:"eval"; nocase; pcre:"/^[^A-Za-z0-9]/R"; flowbits:set,et.exploitkitlanding; reference:url,www.kahusecurity.com/2013/deobfuscating-the-ck-exploit-kit; classtype:exploit-kit; sid:2017408; rev:4; metadata:created_at 2013_09_03, signature_severity Major, updated_at 2022_03_17;)