ET MALWARE TrustConnect RAT CnC Activity (Agent Heartbeat)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE TrustConnect RAT CnC Activity (Agent Heartbeat)";
    flow:established,to_server;
    flowbits:set,ET.TrustConnectHB;
    http.method;
    content:"POST";
    http.uri; bsize:21;
    content:"/api/agents/heartbeat"; fast_pattern;
    http.header_names;
    content:!"|0d 0a|referer|0d 0a|"; nocase;
    content:!"|0d 0a|x-"; nocase;
    http.request_body;
    content:"|7b 22|deviceId|22 3a 22|"; startswith;
    threshold:type limit,count 1,seconds 300,track by_src;
    reference:md5,128e8469959cdb0a8e7e29eb84af0e79;
    classtype:command-and-control;
    sid:2067685; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_02_06, deployment Perimeter, deployment SSLDecrypt, malware_family TrustConnect, confidence High, signature_severity Critical, updated_at 2026_02_17, former_sid 2865957, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
    target:src_ip;
)