alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED Bedep Checkin"; flow:established,to_server; content:"POST"; http_method; urilen:1; content:"Content-Length|3a 20|2"; http_header; content:!"User-Agent|3a|"; http_header; content:!"Accept"; http_header; content:!"Referer|3a|"; http_header; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/P"; pcre:"/^Content-Length\x3a 2\d{2}\r?$/Hmi"; flowbits:set,ET.Trojan.Bedep; classtype:trojan-activity; sid:2019949; rev:2; metadata:created_at 2014_12_16, signature_severity Unknown, updated_at 2019_07_26;)