stix2-elevator 2.0.1

Utilities to upgrade STIX and CybOX content to 2.0

cti-stix-elevator

NOTE: This is an OASIS TC Open Repository. See the Governance section for more information.

The stix2-elevator is a software tool for converting STIX 1.x XML to STIX 2.0 or 2.1 JSON. Due to the differences between STIX 1.x and STIX 2.x, this conversion is best-effort only. During the conversion, stix2- elevator provides information on the assumptions it needs to make to produce valid STIX 2.x JSON, and what information was not able to be converted.

To convert STIX 2.x JSON back to STIX 1.x XML use the stix2-slider

The stix2-elevator is a work-in-progress. It should be used to explore how existing STIX 1.x would potentially be represented in STIX 2.x. Using the current version of the elevator will provide insight to issues that might need to be mitigated to convert your STIX 1.x content.

It should not be used in a production environment, and should not be considered final.

STIX 1.x Composite Indicator Expressions and CybOX 2.x Composite Observable Expressions allow a level of flexibility not present in STIX 2 patterns. These composite expressions can frequently have ambiguous interpretations, so STIX 2 Indicators created by the stix2-elevator from STIX 1.x Indicators containing composite expressions should be inspected to ensure the STIX 2 Indicator has the intended meaning.

For more information, see the documentation on ReadTheDocs.

Please enter any comments on how to improve it into the issue tracker.

Requirements

• Python 2.7, or 3.4+

• python-stix and its dependencies

  Note

  Make sure to use either the latest version of python-stix 1.1.1.x or 1.2.0.x, depending on whether you want to support STIX 1.1.1 or STIX 1.2.

• python-stix2 >= 0.5.1

• stix2-validator >= 2.0.0.dev1 and its dependencies

• pycountry >= 1.20

• stixmarx >= 1.0.3

Installation

Install with pip:

$ pip install stix2-elevator

This will install all necessary dependencies, including the latest version of python-stix.

If you need to support older STIX 1.1.1 content, install python-stix 1.1.1.x first:

$ pip install 'stix<1.2'
$ pip install stix2-elevator

You can also install the stix2-elevator from GitHub to get the latest (unstable) version:

$ pip install git+https://github.com/oasis-open/cti-stix-elevator.git

Usage

It is recommended that you insure that the input STIX 1.x file is valid before submitting it to the elevator. Use the stix-validator.

As A Script

The elevator comes with a bundled script which you can use to elevate STIX 1.1.1 - 1.2.1 content to STIX 2.0 or 2.1 content:

$ stix2_elevator
usage: stix2_elevator [-h] [--incidents] [--no-squirrel-gaps]
          [--package-created-by-id PACKAGE_CREATED_BY_ID]
          [--default-timestamp DEFAULT_TIMESTAMP]
          [--validator-args VALIDATOR_ARGS] [-e ENABLE] [-d DISABLE] [-s]
          [--message-log-directory MESSAGE_LOG_DIRECTORY]
          [--log-level {DEBUG,INFO,WARN,ERROR,CRITICAL}]
          [-m MARKINGS_ALLOWED] [-p {no_policy,strict_policy}]
          [-v VERSION]
          file

stix2-elevator v2.0.1

The stix2-elevator is a work-in-progress. It should be used to explore how existing STIX 1.x would potentially be represented in STIX 2.x. Using the current version of the stix2-elevator will provide insight to issues that might need to be mitigated to convert your STIX 1.x content.

positional arguments:

file The input STIX 1.x document to be elevated.

optional arguments:

-h, --help

show this help message and exit

--incidents

Incidents will be included in the conversion.

--no-squirrel-gaps

Do not include STIX 1.x content that cannot be represented directly in STIX 2.x using the description property.

--infrastructure

Infrastructure will be included in the conversion.

--package-created-by-id PACKAGE_CREATED_BY_ID

Use provided identifier for “created_by_ref” properties. Example: –package-created-by-id “identity –1234abcd-1a12-12a3-0ab4-1234abcd5678”

--default-timestamp DEFAULT_TIMESTAMP

Use provided timestamp for properties that require a timestamp. Example: –default-timestamp “2016-11-15T13:10:35.053000Z”

--validator-args VALIDATOR_ARGS

Arguments to pass to stix-validator. Default: –strict-types Example: stix2_elevator.py <file> –validator-args=”-v –strict-types -d 212”

-e ENABLE, --enable ENABLE

A comma-separated list of the stix2-elevator messages to enable. If the –disable option is not used, no other messages will be shown. Example: stix2_elevator.py <file> –enable 250

-d DISABLE, --disable DISABLE

A comma-separated list of the stix2-elevator messages to disable. Example: stix2_elevator.py <file> –disable 212,220

-s, --silent

If this flag is set, all stix2-elevator messages will be disabled.

--message-log-directory MESSAGE_LOG_DIRECTORY

If this flag is set, all stix2-elevator messages will be saved to file. The name of the file will be the input file with extension .log in the specified directory. Note, make sure the directory already exists. Example: stix2_elevator.py <file> –message- log-directory “..logs”

--log-level

{DEBUG, INFO, WARN, ERROR, CRITICAL} The logging output level.

-m MARKINGS_ALLOWED, --markings-allowed MARKINGS_ALLOWED

Avoid error exit, if these markings are in the content, but not supported by the elevator. Specify as a comma-separated listExample: stix2_elevator.py < file > –markings-allowed “ISAMarkingsAssertion,ISAMarkings”

-p, --policy

{no_policy,strict_policy} The policy to deal with errors

-v, --version VERSION

The version of stix 2 to be produced

Default: 2.0

Refer to elevator_log_messages.rst for all stix2-elevator messages. Use the associated code number to –enable or –disable a message. By default, the stix2-elevator displays all messages. Note: disabling the message does not disable the functionality.

As A Library

You can also use this library to integrate STIX elevation into your own tools. You can elevate a STIX 1.x file:

from stix2elevator import elevate_file
from stix2elevator.options import initialize_options

intialize_options()
results = elevate_file("stix_file.xml")
print(results)

Additionally, a similar method exists to accept a string as an argument:

from stix2elevator import elevate_string
from stix2elevator.options import initialize_options

intialize_options()
results = elevate_string("...")
print(results)

To set options, use set_option_value, found in options.py

Using the stepper

The stix-stepper is a simple script that will convert STIX 2.0 content to STIX 2.1 content.

You can invoke it as follows:

$ stix_stepper <2.0 file>

The 2.1 content is printed to stdout

Governance

This GitHub public repository ( https://github.com/oasis-open/cti-stix-elevator ) was proposed and approved [bis] by the OASIS Cyber Threat Intelligence (CTI) TC as an OASIS TC Open Repository to support development of open source resources related to Technical Committee work.

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Current Maintainers of this TC Open Repository

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• Rich Piazza; GitHub ID: https://github.com/rpiazza/; WWW: MITRE

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