GPL NETBIOS SMB DCERPC Workstation Service unicode bind attempt

alert tcp $EXTERNAL_NET any -> $HOME_NET 139 (
    msg:"GPL NETBIOS SMB DCERPC Workstation Service unicode bind attempt";
    flow:to_server,established;
    content:"|00|"; depth:1;
    content:"|FF|SMB%"; depth:5; offset:4; nocase;
    byte_test:2,&,1,5,relative;
    content:"&|00|"; within:2; distance:56;
    content:"|5C 00|P|00|I|00|P|00|E|00 5C 00 05 00 0B|"; within:15; distance:4;
    byte_test:1,&,16,1,relative;
    content:"|98 D0 FF|k|12 A1 10|6|98|3F|C3 F8|~4Z"; within:16; distance:29;
    reference:bugtraq,9011;
    reference:cve,2003-0812;
    reference:url,www.microsoft.com/technet/security/bulletin/MS03-049.mspx;
    classtype:misc-attack;
    sid:2102308; rev:7;
    metadata:created_at 2010_09_23, cve CVE_2003_0812, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)