GPL NETBIOS SMB-DS Session Setup AndX request username overflow attempt

Query · suricata

flow:to_server,established;
content:"|00|"; depth:1;
byte_test:2,>,322,2;
content:"|FF|SMBs"; depth:5; offset:4; nocase;
byte_test:1,<,128,6,relative;
content:"|00 00 00 00|"; within:4; distance:42;
byte_test:2,>,255,8,relative,little;
content:!"|00|"; within:255; distance:10;
Raw source GPL NETBIOS SMB-DS Session Setup AndX request username overflow attempt · 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 $EXTERNAL_NET any -> $HOME_NET 445 (
    msg:"GPL NETBIOS SMB-DS Session Setup AndX request username overflow attempt";
    flow:to_server,established;
    content:"|00|"; depth:1;
    byte_test:2,>,322,2;
    content:"|FF|SMBs"; depth:5; offset:4; nocase;
    byte_test:1,<,128,6,relative;
    content:"|00 00 00 00|"; within:4; distance:42;
    byte_test:2,>,255,8,relative,little;
    content:!"|00|"; within:255; distance:10;
    reference:bugtraq,9752;
    reference:url,www.eeye.com/html/Research/Advisories/AD20040226.html;
    classtype:attempted-admin;
    sid:2102402; rev:6;
    metadata:created_at 2010_09_23, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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