ET MALWARE Netwire RAT Check-in (set)

alert tcp $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Netwire RAT Check-in (set)";
    flow:established,to_server;
    stream_size:server,<,5;
    dsize:69;
    content:"|41 00 00 00 99|"; depth:5;
    flowbits:set,ET.NetwireRAT.Client;
    flowbits:noalert;
    reference:url,www.circl.lu/pub/tr-23/;
    reference:md5,3c4a93154378e17e71830ff164bb54c4;
    reference:url,unit42.paloaltonetworks.com/new-release-decrypting-netwire-c2-traffic/;
    classtype:trojan-activity;
    sid:2029477; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_07_16, deployment Perimeter, confidence High, signature_severity Major, tag Netwire, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_09;
)