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Subject: Re: [EXT] Re: [cti] Working Call Recap


After talking with Sean on the phone about this, even though this is very late in the game, I think this really makes a lot of sense. I think if we would have thought about this during the Mini-Group we probably would have done this from the get go.

Basically, to be really clear, what he is proposing is that we move the id_method and id_method_details from individual SCOs to the Bundle.  

The pros I see are:
1) less bloat on the wire 
2) simplify some of the indicator text 

We can talk about this in next weekâs working call.  

Bret 



Sent from my Commodore 128D

PGP Fingerprint: 63B4 FC53 680A 6B7D 1447  F2C0 74F8 ACAE 7415 0050

On May 15, 2019, at 8:33 PM, Sean Barnum <sean.barnum@fireeye.com> wrote:

I have reviewed the changes highlighted below and added various comments in the doc.

I see that Bret has already accepted many of them.

 

There is one very major issue we have with a proposed change that would require id_method and id_method_details on EVERY SCO for a producer using a non-default approach for deterministic id generation.

This proposed change would require MASSIVE unnecessary bloat in STIX content as the same exact ~7 lines of JSON would need to be added to every SCO produced. Given the fact that we (and I am sure others) deal with SCOs on the scale of billions this proposed change would make STIX untenable as an option for us.

 

I would like to propose an alternate approach that I think achieves the intended purpose in a MUCH more efficient and unbloated fashion.

I propose that the id_method and id_method_details properties be added to the Bundle object and would assert the deterministic id method used for content within the bundle.

  • It would support the intended purpose under options 1-3
  • It would be far more efficient in that it would only be necessary to specify it a single time for a Bundle that could contain thousands of SCOs.
  • It would be clear and easy to understand.
  • It would allow us to simplify the language under the identifier section of the spec

 

 

 

Sean Barnum

Principal Architect

FireEye

M: 703.473.8262

E: sean.barnum@fireeye.com

 

From: <cti@lists.oasis-open.org> on behalf of Bret Jordan <Bret_Jordan@symantec.com>
Date: Tuesday, May 14, 2019 at 5:56 PM
To: "cti@lists.oasis-open.org" <cti@lists.oasis-open.org>
Subject: [cti] Working Call Recap

 

All,

 

We had a good call today and were able to resolve some of the last few issues that were holding up the release of Working Draft 04.

 

Summary:

 

1) After editorial review we noticed that the language for identifiers would not allow two organizations to write code and produce the same deterministic ID.  So we needed to tighten down the language and define what an OASIS STIX 2 deterministic ID actually is. Prior to the call I worked with Allan, Trey, Rich P, and the MISP folks on an acceptable solution. We reviewed the changes on the working call and the changes are now in section 2.9.  Please review. 

 

2) On the Malware Analysis object we had a property called "analysis_environment" that was a dictionary that used a three value vocabulary.  This design no longer works since we do not have the cyber observable container anymore.  So we had to make a change. The consensus on the call was to use properties on the malware analysis object itself and remove the vocabulary.  Those changes have been made in suggestion mode in section 4.11.  Please review.

 

3) We also accepted small changes to the following sections;

 

a) 2.7 Hashes

b) 3.2 Spec Version

c) 10.13 Infrastructure Type Vocabulary

d) 4.3 Course of Action os_execution_envs

e) 4.13 Observed Data

f) 4.18 Vulnerability Relationships

 

 

Action Items:

 

i) Please make a final in depth review of COA and provide any description text changes you feel appropriate. 

ii) Review the changes to Malware Analysis 

iii) Review the changes to the identifier 

iv) Start making your top down full review of the documents

 

 

Schedule:

On the call we said we would give the TC one more week to review the changes to Malware Analysis and the identifier.  So depending on how next week's working call goes, we might be able to release Working Draft 04 next week. 

 

 

Thanks

Bret

 

 

 

 

 

 

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