ET MALWARE SockRacket/KANDYKORN Client Challenge

alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE SockRacket/KANDYKORN Client Challenge";
    flow:established,to_client;
    flowbits:set,ET.SockRacketClientChallenge;
    stream_size:server,<,10;
    dsize:4;
    content:"|6a d9 58 28|";
    reference:url,elastic.co/security-labs/elastic-catches-dprk-passing-out-kandykorn;
    classtype:trojan-activity;
    sid:2049036; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_11_01, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_01, reviewed_at 2023_11_01;
)