alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Unknown Webserver Backdoor"; flow:established,to_server; http.user_agent; content:"SEX/1"; nocase; fast_pattern; startswith; reference:url,blog.sucuri.net/2013/06/apache-php-injection-to-javascript-files.html; classtype:trojan-activity; sid:2017026; rev:4; metadata:created_at 2013_06_18, confidence Medium, signature_severity Major, updated_at 2020_09_18;)