GPL NETBIOS SMB-DS DCERPC ISystemActivator unicode bind attempt

alert tcp $EXTERNAL_NET any -> $HOME_NET 445 (
    msg:"GPL NETBIOS SMB-DS DCERPC ISystemActivator 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:"|A0 01 00 00 00 00 00 00 C0 00 00 00 00 00 00|F"; within:16; distance:29;
    flowbits:set,dce.isystemactivator.bind.call.attempt;
    reference:bugtraq,8811;
    reference:cve,2003-0813;
    reference:nessus,12206;
    reference:url,www.microsoft.com/technet/security/bulletin/MS04-011.mspx;
    classtype:protocol-command-decode;
    sid:2102491; rev:8;
    metadata:created_at 2010_09_23, cve CVE_2003_0813, confidence Medium, signature_severity Informational, updated_at 2019_07_26;
)