ET MALWARE Bitter APT Backdoor Related Activity

Query · suricata

flow:established,to_server;
dsize:3;
content:"|03 00 dc|"; fast_pattern;
threshold:type both, count 2, seconds 5, track by_src;
Raw source ET MALWARE Bitter APT Backdoor Related Activity · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Bitter APT Backdoor Related Activity";
    flow:established,to_server;
    dsize:3;
    content:"|03 00 dc|"; fast_pattern;
    threshold:type both, count 2, seconds 5, track by_src;
    reference:md5,bd054c4f43808ef37352f36129bf0c3d;
    reference:md5,06a7eccd74a6aa5aa12755cd48829f90;
    reference:md5,532345089619a1881176588a587d3cf1;
    reference:url,ShadowChasing1/status/1504833720489951234;
    classtype:trojan-activity;
    sid:2035533; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_03_18, deployment Perimeter, malware_family Bitter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_18;
)

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