alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET DELETED Bedep Checkin Response"; flow:established,from_server; content:"Content-Type|3a 20|text/html|0d 0a|"; http_header; content:"Content-Length|3a| 108|0d 0a|"; http_header; fast_pattern:only; content:!"Keep-Alive|3a 20|"; http_header; file_data; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R"; classtype:trojan-activity; sid:2019952; rev:5; metadata:created_at 2014_12_16, signature_severity Unknown, updated_at 2019_07_26;)