GPL NETBIOS SMB NT Trans NT CREATE invalid SACL ace size dos attempt

Query · suricata

flow:stateless;
content:"|00|"; depth:1;
content:"|FF|SMB|A0|"; within:5; distance:3;
byte_test:1,!&,128,6,relative;
content:"|01 00|"; within:2; distance:64;
byte_jump:4,-7,little,relative,from_beginning;
content:!"|00 00 00 00|"; within:4; distance:16;
byte_jump:4,16,relative,little;
content:"|00 00|"; within:2; distance:-10;
Raw source GPL NETBIOS SMB NT Trans NT CREATE invalid SACL ace size dos attempt · Suricata
Esc
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 139 (
    msg:"GPL NETBIOS SMB NT Trans NT CREATE invalid SACL ace size dos attempt";
    flow:stateless;
    content:"|00|"; depth:1;
    content:"|FF|SMB|A0|"; within:5; distance:3;
    byte_test:1,!&,128,6,relative;
    content:"|01 00|"; within:2; distance:64;
    byte_jump:4,-7,little,relative,from_beginning;
    content:!"|00 00 00 00|"; within:4; distance:16;
    byte_jump:4,16,relative,little;
    content:"|00 00|"; within:2; distance:-10;
    classtype:protocol-command-decode;
    sid:2103042; rev:5;
    metadata:created_at 2010_09_23, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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