alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET WEB_CLIENT Browlock Landing Page URI Struct"; flow:to_server,established; content:"/?flow_id"; http_uri; content:"/case_id="; http_uri; fast_pattern:only; pcre:"/\/\?flow_id=\d+?&\d+?=\d+?\/case_id=\d+$/U"; classtype:trojan-activity; sid:2017847; rev:2; metadata:created_at 2013_12_13, signature_severity Major, updated_at 2019_07_26;)