ET ADWARE_PUP Niagara Software Update Check

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET ADWARE_PUP Niagara Software Update Check";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri; bsize:16;
    content:"/checkupdate.php";
    http.host;
    content:"4t-niagara.com"; fast_pattern;
    threshold:type limit,count 1,seconds 300,track by_src;
    reference:md5,664a7f2d21f20f4a9747981145cb1332;
    classtype:trojan-activity;
    sid:2068528; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_04_01, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Informational, updated_at 2026_04_01, mitre_tactic_id TA0003, mitre_tactic_name Persistence, mitre_technique_id T1205, mitre_technique_name Traffic_Signaling;
    target:src_ip;
)