ET MALWARE Possible Variant.Kazy.53640 Malformed Client Hello SSL 3.0 (Session_Id length greater than Client_Hello Length)

Query · suricata

flow:to_server,established;
content:"|16 03 00|"; depth:3;
content:"|01|"; distance:2; within:1;
byte_extract:3,0,SSL.Client_Hello.length,relative;
byte_test:1,>,SSL.Client_Hello.length,34,relative;
threshold:type both, track by_src, count 5, seconds 60;
Raw source ET MALWARE Possible Variant.Kazy.53640 Malformed Client Hello SSL 3.0 (Session_Id length greater than Client_Hello Length) · Suricata
Esc
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 443 (
    msg:"ET MALWARE Possible Variant.Kazy.53640 Malformed Client Hello SSL 3.0 (Session_Id length greater than Client_Hello Length)";
    flow:to_server,established;
    content:"|16 03 00|"; depth:3;
    content:"|01|"; distance:2; within:1;
    byte_extract:3,0,SSL.Client_Hello.length,relative;
    byte_test:1,>,SSL.Client_Hello.length,34,relative;
    threshold:type both, track by_src, count 5, seconds 60;
    reference:md5,a01d75158cf4618677f494f9626b1c4c;
    classtype:trojan-activity;
    sid:2014634; rev:2;
    metadata:created_at 2012_04_24, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_08_13;
)

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