alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT KaiXin EK Possible Jar Download"; flow:established,to_server; http.user_agent; content:"Java/1."; http.cookie; content:"=Yes"; fast_pattern; pcre:"/nb[\d+]=Yes/"; classtype:exploit-kit; sid:2020478; rev:4; metadata:created_at 2015_02_19, confidence Medium, signature_severity Major, updated_at 2024_03_18;)