1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
DCERPC Keywords
================
Following keywords can be used for matching on fields in headers and payloads
of DCERPC packets over UDP, TCP and SMB.
dcerpc.iface
-------------
Match on the value of the interface UUID in a DCERPC header. If `any_frag` option
is given, the match shall be done on all fragments. If it's not, the match shall
only happen on the first fragment.
The format of the keyword::
dcerpc.iface:<uuid>;
dcerpc.iface:<uuid>,[>,<,!,=]<iface_version>;
dcerpc.iface:<uuid>,any_frag;
dcerpc.iface:<uuid>,[>,<,!,=]<iface_version>,any_frag;
Examples::
dcerpc.iface:367abb81-9844-35f1-ad32-98f038001003;
dcerpc.iface:367abb81-9844-35f1-ad32-98f038001003,!10;
dcerpc.iface:367abb81-9844-35f1-ad32-98f038001003,any_frag;
dcerpc.iface:367abb81-9844-35f1-ad32-98f038001003,>1,any_frag;
ET Open rule example:
.. container:: example-rule
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;)
dcerpc.opnum
-------------
Match on one or many operation numbers and/or operation number range within the
interface in a DCERPC header.
The format of the keyword::
dcerpc.opnum:<u16>;
dcerpc.opnum:[>,<,!,=]<u16>;
dcerpc.opnum:<u16>,<u16>,<u16>....;
dcerpc.opnum:<u16>-<u16>;
Examples::
dcerpc.opnum:15;
dcerpc.opnum:>10;
dcerpc.opnum:12,24,62,61;
dcerpc.opnum:12,18-24,5;
dcerpc.opnum:12-14,12,121,62-78;
dcerpc.stub_data
-----------------
Match on the stub data in a given DCERPC packet. It is a 'sticky buffer'.
Example::
dcerpc.stub_data; content:"123456";
Additional information
-----------------------
More information on the protocol can be found here:
* DCERPC: `<https://pubs.opengroup.org/onlinepubs/9629399/chap1.htm>`_
|
