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72 lines
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72 lines
2.0 KiB
ReStructuredText
DCERPC Keywords
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================
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Following keywords can be used for matching on fields in headers and payloads
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of DCERPC packets over UDP, TCP and SMB.
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dcerpc.iface
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-------------
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Match on the value of the interface UUID in a DCERPC header. If `any_frag` option
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is given, the match shall be done on all fragments. If it's not, the match shall
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only happen on the first fragment.
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The format of the keyword::
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dcerpc.iface:<uuid>;
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dcerpc.iface:<uuid>,[>,<,!,=]<iface_version>;
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dcerpc.iface:<uuid>,any_frag;
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dcerpc.iface:<uuid>,[>,<,!,=]<iface_version>,any_frag;
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Examples::
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dcerpc.iface:367abb81-9844-35f1-ad32-98f038001003;
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dcerpc.iface:367abb81-9844-35f1-ad32-98f038001003,!10;
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dcerpc.iface:367abb81-9844-35f1-ad32-98f038001003,any_frag;
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dcerpc.iface:367abb81-9844-35f1-ad32-98f038001003,>1,any_frag;
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ET Open rule example:
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.. container:: example-rule
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alert tcp any any -> $HOME_NET any (msg:"ET NETBIOS DCERPC WMI Remote Process Execution"; flow:to_server,established; dce_iface:00000143-0000-0000-c000-000000000046; classtype:bad-unknown; sid:2027167; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_04_09, deployment Internal, former_category NETBIOS, signature_severity Informational, updated_at 2019_04_09;)
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dcerpc.opnum
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-------------
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Match on one or many operation numbers and/or operation number range within the
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interface in a DCERPC header.
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The format of the keyword::
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dcerpc.opnum:<u16>;
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dcerpc.opnum:[>,<,!,=]<u16>;
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dcerpc.opnum:<u16>,<u16>,<u16>....;
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dcerpc.opnum:<u16>-<u16>;
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Examples::
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dcerpc.opnum:15;
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dcerpc.opnum:>10;
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dcerpc.opnum:12,24,62,61;
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dcerpc.opnum:12,18-24,5;
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dcerpc.opnum:12-14,12,121,62-78;
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dcerpc.stub_data
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-----------------
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Match on the stub data in a given DCERPC packet. It is a 'sticky buffer'.
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Example::
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dcerpc.stub_data; content:"123456";
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Additional information
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-----------------------
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More information on the protocol can be found here:
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* DCERPC: `<https://pubs.opengroup.org/onlinepubs/9629399/chap1.htm>`_
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