GPL NETBIOS SMB-DS C$ share access

Query · suricata

flow:established,to_server;
content:"|00|"; depth:1;
content:"|FF|SMBu"; within:5; distance:3;
byte_test:1,!&,128,6,relative;
byte_jump:2,34,little,relative;
content:"C|24 00|"; distance:2; nocase;
content:!"IPC|24 00|"; within:5; distance:-5; nocase;
Raw source GPL NETBIOS SMB-DS C$ share access · 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 -> $HOME_NET 445 (
    msg:"GPL NETBIOS SMB-DS C$ share access";
    flow:established,to_server;
    content:"|00|"; depth:1;
    content:"|FF|SMBu"; within:5; distance:3;
    byte_test:1,!&,128,6,relative;
    byte_jump:2,34,little,relative;
    content:"C|24 00|"; distance:2; nocase;
    content:!"IPC|24 00|"; within:5; distance:-5; nocase;
    classtype:protocol-command-decode;
    sid:2102471; rev:12;
    metadata:created_at 2010_09_23, confidence Medium, signature_severity Informational, updated_at 2019_07_26;
)

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