ET MALWARE Red Leaves magic packet detected (APT10 implant)

alert tcp $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Red Leaves magic packet detected (APT10 implant)";
    flow:established,to_server;
    dsize:12;
    content:"|7a 8d 9b dc|"; offset:4; depth:4;
    flowbits:set,ncc.apt10.beacon_send;
    threshold:type limit, track by_src, count 1, seconds 600;
    reference:url,github.com/nccgroup/Cyber-Defence/blob/master/Technical%20Notes/Red%20Leaves/Red%20Leaves%20technical%20note%20v1.0.pdf;
    reference:url,blog.jpcert.or.jp/2017/04/redleaves---malware-based-on-open-source-rat.html;
    classtype:targeted-activity;
    sid:2024173; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_04_04, deployment Perimeter, malware_family RedLeaves, malware_family Red_Leaves, performance_impact Low, confidence High, signature_severity Major, tag APT10, tag RedLeaves, updated_at 2019_07_26;
)