ET MALWARE TrustConnect RAT CnC Activity (Failed Registration)

Query · suricata

flow:established,to_client;
flowbits:isset,ET.TrustConnect.Reg;
http.response_body; bsize:54;
content:"|7b 22|message|22 3a 22|Invalid|20|or|20|missing|20|registration|20|API|20|key|2e 22 7d|";
threshold:type limit,count 1,seconds 300,track by_src;
target:dest_ip;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET MALWARE TrustConnect RAT CnC Activity (Failed Registration) · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE TrustConnect RAT CnC Activity (Failed Registration)";
    flow:established,to_client;
    flowbits:isset,ET.TrustConnect.Reg;
    http.response_body; bsize:54;
    content:"|7b 22|message|22 3a 22|Invalid|20|or|20|missing|20|registration|20|API|20|key|2e 22 7d|";
    threshold:type limit,count 1,seconds 300,track by_src;
    reference:md5,128e8469959cdb0a8e7e29eb84af0e79;
    classtype:command-and-control;
    sid:2067804; 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_17, deployment Perimeter, deployment SSLDecrypt, malware_family TrustConnect, confidence High, signature_severity Critical, tag c2, updated_at 2026_02_23, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
    target:dest_ip;
)

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