ET MALWARE PackClient RAT Client Heartbeat

alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE PackClient RAT Client Heartbeat";
    flow:established,to_server;
    flowbits:set,ET.PackClient_RAT.Heartbeat;
    dsize:8;
    content:"|04 00 40 5a 01 00 00 00|"; fast_pattern;
    reference:md5,c55f9bc3c53ac32e6169ad3cc8b2ce49;
    classtype:trojan-activity;
    sid:2069886; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state plaintext, created_at 2026_06_10, deployment Perimeter, malware_family PackClient_RAT, performance_impact Low, confidence High, signature_severity Major, tag RAT, updated_at 2026_06_10;
    target:src_ip;
)