ET MALWARE StealC_V2 CnC Activity (POST)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE StealC_V2 CnC Activity (POST)";
    flow:established,to_server;
    urilen:14;
    http.method;
    content:"POST";
    http.uri;
    content:"/save_keys.php"; fast_pattern;
    http.user_agent; bsize:11;
    content:"Mozilla/5.0";
    http.request_body;
    content:"keys=[FILE]"; startswith;
    content:".dll|0d 0a|KEY|3a 20 20|"; distance:0;
    threshold:type limit,count 1,seconds 300,track by_src;
    classtype:trojan-activity;
    sid:2066360; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_12_17, deployment Perimeter, deployment SSLDecrypt, malware_family Stealc, confidence High, signature_severity Critical, tag c2, updated_at 2025_12_17, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
    target:src_ip;
)