alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE ClearFake CnC Checkin (POST)"; flow:established,to_server; urilen:18; http.method; content:"POST"; http.uri; content:"|2f|post|2e|php|3f|status|3d|"; startswith; fast_pattern; pcre:"/^\x2fpost\x2ephp\x3fstatus\x3d\d$/"; content:!"|0d 0a|Referer|0d 0a|"; http.content_len; bsize:1; content:"0"; http.content_type; bsize:33; content:"application/x-www-form-urlencoded"; http.connection; content:"Keep-Alive"; reference:md5,b3b735852084909f82121fd6fbbdeb68; classtype:trojan-activity; sid:2053416; rev:1; metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_06_10, deployment Perimeter, deployment SSLDecrypt, malware_family ClearFake, confidence Medium, signature_severity Critical, tag c2, tag compromised_website, updated_at 2024_06_10, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)