alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT Turla/SPL EK Java Exploit"; flow:established,from_server; flowbits:isset,ET.http.javaclient; file_data; content:"a/hidden.class"; nocase; reference:url,securelist.com/analysis/publications/65545/the-epic-turla-operation/; classtype:targeted-activity; sid:2018924; rev:2; metadata:created_at 2014_08_12, confidence High, signature_severity Major, updated_at 2019_07_26;)