ET DOS Excessive Large Tree Connect Response

Query · suricata

flow:from_server,established;
byte_test:3,>,1000,1;
content:"|fe 53 4d 42 40 00|"; offset:4; depth:6;
content:"|03 00|"; offset:16; depth:2;
Raw source ET DOS Excessive Large Tree Connect Response · 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 any 445 -> $HOME_NET any (
    msg:"ET DOS Excessive Large Tree Connect Response";
    flow:from_server,established;
    byte_test:3,>,1000,1;
    content:"|fe 53 4d 42 40 00|"; offset:4; depth:6;
    content:"|03 00|"; offset:16; depth:2;
    reference:url,isc.sans.edu/forums/diary/Windows+SMBv3+Denial+of+Service+Proof+of+Concept+0+Day+Exploit/22029/;
    classtype:attempted-dos;
    sid:2023831; rev:3;
    metadata:affected_product SMBv3, attack_target Client_and_Server, created_at 2017_02_03, deployment Datacenter, signature_severity Major, updated_at 2020_08_19;
)

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