alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED Unknown checkin"; flow:established,to_server; content:"POST"; http_method; content:"/c.php"; fast_pattern; http_uri; content:"User-Agent|3a| Mozilla/4.0 compatible|3b| MSIE 8.0|3b| Windows NT 5.1|3b| Trident/4.0|3b| |0d 0a|"; http_header; classtype:trojan-activity; sid:2013803; rev:5; metadata:created_at 2011_10_26, signature_severity Unknown, updated_at 2019_07_26;)