Definition, description and relationship types of MISP objects
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README.md

misp-objects

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MISP objects used in MISP (starting from 2.4.80) system and can be used by other information sharing tool. MISP objects are in addition to MISP attributes to allow advanced combinations of attributes. The creation of these objects and their associated attributes are based on real cyber security use-cases and existing practices in information sharing.

Feel free to propose your own MISP objects to be included in MISP. The system is similar to the misp-taxonomies where anyone can contribute their own objects to be included in MISP without modifying software.

Format of MISP objects

{
        "name": "domain|ip",
        "meta-category": "network",
        "description": "A domain and IP address seen as a tuple in a specific time frame.",
        "version": 1,
        "uuid": "f47559d7-6c16-40e8-a6b0-eda4a008376f",
        "attributes" :
        {
                "ip": {
                        "misp-attribute": "ip-dst",
                        "ui-priority": 1,
                        "categories": ["Network activity","External analysis"]
                },
                "domain": {
                        "misp-attribute": "domain",
                        "ui-priority": 1,
                        "categories": ["Network activity","External analysis"]
                },
                "first-seen": {
                        "misp-attribute": "datetime",
                        "disable_correlation": true,
                        "ui-priority": 0
                },
                "last-seen": {
                        "misp-attribute": "datetime",
                        "disable_correlation": true,
                        "ui-priority": 0
                }

        },
        "required": ["ip","domain"]
}

A MISP object is described in a simple JSON file containing the following element.

  • name is the name of the your object.
  • meta-category is the category where the object falls into. (file, network, financial, misc, internal)
  • description is a summary of the object description.
  • version is the version number as a decimal value.
  • required is an array containing the minimal required attributes to describe the object.
  • requiredOneOf is an array containing the attributes where at least one need to be present to describe the object.
  • attributes contains another JSON object listing all the attributes composing the object.

Each attribute must contain a reference misp-attribute to reference an existing attribute definition in MISP (MISP attributes types are case-sensitive). An array categories shall be used to described in which categories the attribute is. The ui-priority describes the usage frequency of an attribute. This helps to only display the most frequently used attributes and allowing advanced users to show all the attributes depending of their configuration. An optional multiple field shall be set to true if multiple elements of the same key can be used in the object. An optional values_list where this list of value can be selected as a value for an attribute. An optional sane_default where this list of value recommend potential a sane default for an attribute. An optional disable_correlation boolean field to suggest the disabling of correlation for a specific attribute.

Existing MISP objects

MISP objects relationships

The MISP object model is open and allows user to use their own relationships. MISP provides a list of default relationships that can be used if you plan to share your events with other MISP communities.

  • relationships - list of predefined default relationships which can be used to link MISP objects together and explain the context of the relationship.

How to contribute MISP objects?

Fork the project, create a new directory in the objects directory matching your object name. Objects must be composed of existing MISP attributes. If you are missing a specific attributes, feel free to open an issue in the MISP project.

We recommend to add a text attribute in a object to allow users to add comments or correlating text.

If the unparsed object can be included, a raw-base64 attribute can be used in the object to import the whole object.

Every object needs a uuid which can be created using uuidgen -r on a linux command line.

When the object is created, pull a request on this project. We usually merge the objects if it fits existing use-cases.

MISP objects documentation

The MISP objects are documented at the following location in HTML and PDF.

The documentation is automatically generated from the MISP objects template expressed in JSON.

What are the advantages of MISP objects versus existing standards?

MISP objects are dynamically used objects that are contributed by users of MISP (the threat sharing platform) or other information sharing platforms.

The aim is to allow a dynamic update of objects definition in operational distributed sharing systems like MISP. Security threats and their related indicators are quite dynamic, standardized formats are quite static and new indicators require a significant time before being standardized.

The MISP objects model allows to add new combined indicators format based on their usage without changing the underlying code base of MISP or other threat sharing platform using it. The definition of the objects can be then propagated along with the indicators itself.

License


Copyright (C) 2016-2018 Andras Iklody
Copyright (C) 2016-2018 Alexandre Dulaunoy
Copyright (C) 2016-2018 CIRCL - Computer Incident Response Center Luxembourg

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.