alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT HellSpawn EK Requesting Jar"; flow:established,to_server; content:"/j21.jar"; http_uri; content:"Java/1."; http_user_agent; classtype:exploit-kit; sid:2016832; rev:7; metadata:created_at 2013_05_07, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)