STIX^™ Version 1.2.1. Part 1: Overview. Edited by Sean Barnum, Desiree Beck, Aharon Chernin, and Rich Piazza. Latest version: http://docs.oasis-open.org/cti/stix/v1.2.1/stix-v1.2.1-part1-overview.html.

CybOX^™ Version 2.1.1. Part 01: Overview. Edited by Trey Darley, Ivan Kirillov, Rich Piazza, and Desiree Beck. Latest version: http://docs.oasis-open.org/cti/cybox/v2.1.1/cybox-v2.1.1-part01-overview.html.

This specification is related to:

TAXII^™ Version 2.0. Edited by John Wunder, Mark Davidson, and Bret Jordan. Latest version: http://docs.oasis-open.org/cti/taxii/v2.0/taxii-v2.0.html.

Abstract:

Structured Threat Information Expression (STIX^™) is a language for expressing cyber threat and observable information. This document defines concepts that apply across all of STIX and defines the overall structure of the STIX language.

Status:

This document was last revised or approved by the OASIS Cyber Threat Intelligence (CTI) TC on the above date. The level of approval is also listed above. Check the “Latest version” location noted above for possible later revisions of this document. Any other numbered Versions and other technical work produced by the Technical Committee (TC) are listed at https://www.oasis-open.org/committees/tc_home.php?wg_abbrev=cti#technical.

TC members should send comments on this specification to the TC’s email list. Others should send comments to the TC’s public comment list, after subscribing to it by following the instructions at the “Send A Comment” button on the TC’s web page at https://www.oasis-open.org/committees/cti/.

This Committee Specification is provided under the Non-Assertion Mode of the OASIS IPR Policy, the mode chosen when the Technical Committee was established. For information on whether any patents have been disclosed that may be essential to implementing this specification, and any offers of patent licensing terms, please refer to the Intellectual Property Rights section of the TC’s web page (https://www.oasis-open.org/committees/cti/ipr.php).

Note that any machine-readable content (Computer Language Definitions) declared Normative for this Work Product is provided in separate plain text files. In the event of a discrepancy between any such plain text file and display content in the Work Product's prose narrative document(s), the content in the separate plain text file prevails.

Citation format:

When referencing this specification the following citation format should be used:

[STIX-v2.0-Pt1-Core]

STIX™ Version 2.0. Part 1: STIX Core Concepts. Edited by Rich Piazza, John Wunder, and Bret Jordan. 19 July 2017. OASIS Committee Specification 01. http://docs.oasis-open.org/cti/stix/v2.0/cs01/part1-stix-core/stix-v2.0-cs01-part1-stix-core.html. Latest version: http://docs.oasis-open.org/cti/stix/v2.0/stix-v2.0-part1-stix-core.html.

Notices

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This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published, and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this section are included on all such copies and derivative works. However, this document itself may not be modified in any way, including by removing the copyright notice or references to OASIS, except as needed for the purpose of developing any document or deliverable produced by an OASIS Technical Committee (in which case the rules applicable to copyrights, as set forth in the OASIS IPR Policy, must be followed) or as required to translate it into languages other than English.

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This document and the information contained herein is provided on an "AS IS" basis and OASIS DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY OWNERSHIP RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

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OASIS takes no position regarding the validity or scope of any intellectual property or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; neither does it represent that it has made any effort to identify any such rights. Information on OASIS' procedures with respect to rights in any document or deliverable produced by an OASIS Technical Committee can be found on the OASIS website. Copies of claims of rights made available for publication and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this OASIS Committee Specification or OASIS Standard, can be obtained from the OASIS TC Administrator. OASIS makes no representation that any information or list of intellectual property rights will at any time be complete, or that any claims in such list are, in fact, Essential Claims.

The name "OASIS" is a trademark of OASIS, the owner and developer of this specification, and should be used only to refer to the organization and its official outputs. OASIS welcomes reference to, and implementation and use of, specifications, while reserving the right to enforce its marks against misleading uses. Please see https://www.oasis-open.org/policies-guidelines/trademark for above guidance.

STIX™, CYBOX™, AND TAXII™ (STANDARD OR STANDARDS) AND THEIR COMPONENT PARTS ARE PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY THAT THESE STANDARDS OR ANY OF THEIR COMPONENT PARTS WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT THE STANDARDS OR THEIR COMPONENT PARTS WILL BE ERROR FREE, OR ANY WARRANTY THAT THE DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE STANDARDS OR THEIR COMPONENT PARTS. IN NO EVENT SHALL THE UNITED STATES GOVERNMENT OR ITS CONTRACTORS OR SUBCONTRACTORS BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT, INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM, OR IN ANY WAY CONNECTED WITH THESE STANDARDS OR THEIR COMPONENT PARTS OR ANY PROVIDED DOCUMENTATION, WHETHER OR NOT BASED UPON WARRANTY, CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT OF THE RESULTS OF, OR USE OF, THE STANDARDS, THEIR COMPONENT PARTS, AND ANY PROVIDED DOCUMENTATION. THE UNITED STATES GOVERNMENT DISCLAIMS ALL WARRANTIES AND LIABILITIES REGARDING THE STANDARDS OR THEIR COMPONENT PARTS ATTRIBUTABLE TO ANY THIRD PARTY, IF PRESENT IN THE STANDARDS OR THEIR COMPONENT PARTS AND DISTRIBUTES IT OR THEM "AS IS."

Table of Contents

1 Introduction 7

1.0 IPR Policy 7

1.1 Terminology 7

1.2 Normative References 7

1.3 Non-Normative References 8

1.4 Overview 8

1.4.1 Graph-Based Model 8

1.4.2 STIX™ Domain Objects 9

1.4.3 STIX™ Relationships 9

1.4.4 Cyber Observables 10

1.4.5 STIX™ Patterning 10

1.4.6 Vocabularies 10

1.4.7 Serialization 10

1.4.8 Transporting STIX™ 11

1.5 Naming Requirements 11

1.5.1 Property Names and String Literals 11

1.5.2 Reserved Names 11

1.6 Document Conventions 11

1.6.1 Naming Conventions 11

1.6.2 Font Colors and Style 11

2 Common Data Types 12

2.1 Boolean 12

2.2 External Reference 13

2.2.1 Properties 13

2.2.2 Requirements 13

2.3 Float 15

2.4 Hashes 16

2.5 Identifier 16

2.6 Integer 17

2.7 Kill Chain Phase 17

2.8 List 18

2.9 Open Vocabulary 19

2.10 String 20

2.11 Timestamp 20

2.11.1 Requirements 20

3 STIX™ Objects 21

3.1 Common Properties 21

3.2 IDs and References 23

3.3 Object Creator 23

3.4 Versioning 24

3.4.1 Versioning Timestamps 24

3.4.2 New Version or New Object? 25

3.5 Common Relationships 29

3.6 Reserved Properties 30

4 Data Markings 31

4.1 Marking Definition 31

4.1.1 Properties 31

4.1.2 Relationships 33

4.1.3 Statement Marking Object Type 33

4.1.4 TLP Marking Object Type 34

4.2 Object Markings 35

4.3 Granular Markings 36

4.3.1 Granular Marking Type 36

4.3.1.1 Selector Syntax 36

5 Bundle 39

5.1 Properties 39

5.2 Relationships 40

6 Vocabularies 41

6.1 Attack Motivation 41

6.2 Attack Resource Level 43

6.3 Hashing Algorithm Vocabulary 44

6.4 Identity Class 46

6.5 Indicator Label 47

6.6 Industry Sector 47

6.7 Malware Label 49

6.8 Report Label 51

6.9 Threat Actor Label 52

6.10 Threat Actor Role 55

6.11 Threat Actor Sophistication 56

6.12 Tool Label 58

7 Customizing STIX™ 60

7.1 Custom Properties 60

7.1.1 Requirements 60

7.2 Custom Objects 61

7.2.1 Requirements 61

8 Conformance 62

8.1 Producers and Consumers 62

8.2 Mandatory Features 62

8.2.1 Versioning 62

8.3 Optional Features 62

8.3.1 Object-Level Data Markings 62

8.3.2 Granular Data Markings 62

8.3.3 Custom Properties 62

8.3.4 Custom Objects 63

Appendix A. Glossary 64

Appendix B. Acknowledgments 65

Appendix C. Revision History 71

STIX™ Version 2.0. Part 1: STIX Core Concepts

STIX™ Version 2.0. Part 1: STIX Core Concepts

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