GPL NETBIOS SMB-DS IActivation unicode bind attempt

alert tcp $EXTERNAL_NET any -> $HOME_NET 445 (
    msg:"GPL NETBIOS SMB-DS IActivation unicode bind attempt";
    flow:established,to_server;
    content:"|00|"; depth:1;
    content:"|FF|SMB%"; within:5; distance:3;
    byte_test:1,&,128,6,relative;
    content:"&|00|"; within:2; distance:56;
    content:"|5C 00|P|00|I|00|P|00|E|00 5C 00 00 00|"; distance:4; nocase;
    byte_jump:2,-17,relative,from_beginning,little;
    isdataat:4,relative;
    content:"|05|";
    byte_test:1,!&,16,3,relative;
    content:"|0B|"; within:1; distance:1;
    content:"|B8|J|9F|M|1C|}|CF 11 86 1E 00| |AF|n|7C|W"; within:16; distance:29;
    flowbits:set,dce.iactivation.bind;
    flowbits:noalert;
    classtype:protocol-command-decode;
    sid:2103387; rev:4;
    metadata:created_at 2010_09_23, confidence Medium, signature_severity Informational, updated_at 2019_07_26;
)