ET MALWARE CountLoader CnC Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE CountLoader CnC Checkin";
    flow:established,to_server;
    flowbits:set,ET.CountLoader;
    http.method;
    content:"GET";
    http.uri;
    content:"|2f|connect|3f|hwid|3d|"; fast_pattern;
    content:"&buildId="; distance:0;
    content:"&av="; distance:0;
    content:"&username="; distance:0;
    reference:url,silentpush.com/blog/countloader;
    reference:md5,8beece81a6dca4e5a8483f56917344ff;
    classtype:trojan-activity;
    sid:2072401; rev:1;
    metadata:affected_product Windows_Client, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_10_08, deployment Perimeter, deployment SSLDecrypt, malware_family CountLoader, confidence High, signature_severity Critical, updated_at 2026_10_08, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
    target:src_ip;
)