cti-stix — archive

Re: [cti-stix] Proposal - Top Level Relationship Object

From: Bret Jordan <[email protected]>
To: [email protected]
Date: Wed, 29 Jul 2015 22:13:00 -0000

Terry I like where you are going with this..... Thanks, Bret Bret Jordan CISSP Director of Security Architecture and Standards Office of the CTO Blue Coat Systems PGP Fingerprint: 63B4 FC53 680A 6B7D 1447 F2C0 74F8 ACAE 7415 0050 Without cryptography vihv vivc ce xhrnrw, however, the only thing that can not be unscrambled is an egg. On Jul 29, 2015, at 16:06, Terry MacDonald < [email protected] > wrote: I was thinking back to the Admiralty Code ( https://en.wikipedia.org/wiki/Admiralty_code ) regarding reliability and credibility when I wrote that. The idea was if someone had learned from a 3rd party that there was a relationship between Threat Group A and Threat Group B, but had not yet been able to determine the reliability/truthfulness of what that third party had said. They may want to send out that relationship, as kind of a 'something we've heard but not had a chance to verify ourselves'. That's where I was headed with the Unknown option. Maybe it would be better to use the terms from Information Reliability instead of Confidence when describing relationships within STIX? ( https://en.wikipedia.org/wiki/Intelligence_source_and_information_reliability ) Rating Description 1 Confirmed Logical, consistent with other relevant information, confirmed by independent sources. 2 Probably true Logical, consistent with other relevant information, not confirmed. 3 Possibly true Reasonably logical, agrees with some relevant information, not confirmed. 4 Doubtfully true Not logical but possible, no other information on the subject, not confirmed. 5 Improbable Not logical, contradicted by other relevant information. 6 Cannot be judged The validity of the information can not be determined. Just a thought. Cheers Terry MacDonald STIX, TAXII, CybOX Consultant M: +61-407-203-026 E: [email protected] W: www.threatloop.com Disclaimer: The opinions expressed within this email do not represent the sentiment of any other party except my own. My views do not necessarily reflect those of my employers. On 30 July 2015 at 07:12, Jason Keirstead < [email protected] > wrote: What is the use case where someone is asserting something with no information behind it though? I am kind of lost on that. Why would it be being asserted? - Jason Keirstead Product Architect, Security Intelligence, IBM Security Systems www.ibm.com/security www.securityintelligence.com Without data, all you are is just another person with an opinion - Unknown <graycol.gif> Terry MacDonald ---2015/07/29 06:03:11 PM---I think there is a difference: 0 confidence = I have checked this information and I do not have any From: Terry MacDonald < [email protected] > To: Jason Keirstead/CanEast/IBM@IBMCA Cc: Wunder, John A. < [email protected] >, Aharon Chernin < [email protected] >, Baker, Jon < [email protected] >, Jordan, Bret < [email protected] >, Chris O'Brien < [email protected] >, [email protected] < [email protected] >, JG on CTI-TC < [email protected] > Date: 2015/07/29 06:03 PM Subject: Re: [cti-stix] Proposal - Top Level Relationship Object Sent by: < [email protected] > I think there is a difference: 0 confidence = I have checked this information and I do not have any faith that it is true. Unknown = There is no information to say if this is true or not true. We have no way to infer anything at present. --- I'd also say that there is the potential here for using something like the Admiralty code as a replacement for confidence..... https://en.wikipedia.org/wiki/Admiralty_code : Reliability of Source A - Completely reliable B - Usually reliable C - Fairly reliable D - Not usually reliable E - Unreliable F - Reliability cannot be judged Accuracy of data (Credibility) 1 - Confirmed by other sources 2 - Probably True 3 - Possibly True 4 - Doubtful 5 - Improbable 6 - Truth cannot be judged Maybe that makes sense more so than Confidence? --- I also believe that we need to keep each relationship as a single direction relationship, to enable someone to discern a 'hierarchy' from the relationships they receive, rather than just a 'group' (as highlighted by others on the thread). If we combine all the relationships into a pool, we lose the ability of separating those relationships back out. I would like to keep the Source_ID and Target_ID separation. ID [1] [Required]: The ID of the relationship Version [ 1] [Required]: The version of the relationship; a simple number to be used with the ID for version control (instead of timestamp) Type [1] [Required]: The “type” of relationship being expressed. (Not sure of how this works yet) Description [0..N] [Optional]: Words about the relationship. Source_ID [1] [Required] : The ID of one or more source entities in the relationship as a URI (not QName) Target_ID [1..N] [Required]: The ID of one or more targets in the relationship as a URI (not QName) Start_Time [0..1] [Required]: A timestamp in UTC stating when the relationship between the objects started, or the text 'unknown'. End_Time [0..1] [Required]: A timestamp in UTC stating when the relationship between the objects ended, or the text 'ongoing', or the text 'unknown'. Confidence [1] [Required]: A measure of confidence in the relationship. (or should we look at Reliability/Credibility as discussed above?) Timestamp [0..1] [Required]: A timestamp in UTC stating when the relationship object was created. Cheers Terry MacDonald STIX, TAXII, CybOX Consultant M: +61-407-203-026 E: [email protected] W: www.threatloop.com Disclaimer: The opinions expressed within this email do not represent the sentiment of any other party except my own. My views do not necessarily reflect those of my employers. On 30 July 2015 at 05:25, Jason Keirstead < [email protected] > wrote: Well... 0 would be exactly what it says... zero confidence, aka no confidence . Is there a difference between no confidence and unknown confidence ? To me they're the same thing... if you don't know, you don't know. - Jason Keirstead Product Architect, Security Intelligence, IBM Security Systems www.ibm.com/security www.securityintelligence.com Without data, all you are is just another person with an opinion - Unknown <graycol.gif> Wunder, John A. ---2015/07/29 04:23:55 PM---I don't know, what does a confidence of 0 mean? To me the statement that the confidence is unknown i From: Wunder, John A. < [email protected] > To: Jason Keirstead/CanEast/IBM@IBMCA Cc: Jordan, Bret < [email protected] >, Aharon Chernin < [email protected] >, Baker, Jon < [email protected] >, JG on CTI-TC < [email protected] >, Chris O'Brien < [email protected] >, [email protected] < [email protected] > Date: 2015/07/29 04:23 PM Subject: Re: [cti-stix] Proposal - Top Level Relationship Object I don't know, what does a confidence of 0 mean? To me the statement that the confidence is unknown is quite different from the statement that the confidence very low. From: < [email protected] > on behalf of Jason Keirstead Date: Wednesday, July 29, 2015 at 3:19 PM To: Wunder, John A. Cc: Jordan, Bret , Aharon Chernin, Jon Baker, JG on CTI-TC, Chris O'Brien, [email protected] Subject: Re: [cti-stix] Proposal - Top Level Relationship Object What is the difference between having confidence be optional or unknown and assigning a value of 0? - Jason Keirstead Product Architect, Security Intelligence, IBM Security Systems www.ibm.com/security www.securityintelligence.com Without data, all you are is just another person with an opinion - Unknown <graycol.gif> Wunder, John A. ---2015/07/29 03:10:51 PM---I agree with you on reducing optionality but to me these unknown values are just hiding optionalit From: Wunder, John A. < [email protected] > To: Jordan, Bret < [email protected] >, Aharon Chernin < [email protected] > Cc: Baker, Jon < [email protected] >, JG on CTI-TC < [email protected] >, Chris O'Brien < [email protected] >, [email protected] < [email protected] > Date: 2015/07/29 03:10 PM Subject: Re: [cti-stix] Proposal - Top Level Relationship Object Sent by: < [email protected] > I agree with you on reducing optionality but to me these unknown values are just hiding optionality rather than eliminating it. If anything it seems like having the field not present vs. a special unknown value is more obvious and explicit because it makes it clear that it's a special case. Otherwise you're going to have a lot of if val == 'unknown' code paths, and hardcoded strings with special meanings are bad. John From: Jordan, Bret Date: Wednesday, July 29, 2015 at 1:55 PM To: Aharon Chernin Cc: Jon Baker, Wunder, John A. , JG on CTI-TC, Chris O'Brien, [email protected] Subject: Re: [cti-stix] Proposal - Top Level Relationship Object It has to be that way... Confidence has to be required, even if the the value is unknown . We need to reduce the optionality and make code decision trees easier. Thanks, Bret Bret Jordan CISSP Director of Security Architecture and Standards Office of the CTO Blue Coat Systems PGP Fingerprint: 63B4 FC53 680A 6B7D 1447 F2C0 74F8 ACAE 7415 0050 Without cryptography vihv vivc ce xhrnrw, however, the only thing that can not be unscrambled is an egg. On Jul 29, 2015, at 08:57, Aharon Chernin < [email protected] > wrote: Have you considered the case where an analyst wants to simply say that this collection of objects seems to be related? Wouldn't this just be a low confidence relationship? Aharon Chernin CTO SOLTRA An FS-ISAC & DTCC Company 18301 Bermuda green Dr Tampa, fl 33647 813.470.2173 [email protected] www.soltra.com From: [email protected] < [email protected] > on behalf of Baker, Jon < [email protected] > Sent: Wednesday, July 29, 2015 8:37 AM To: Wunder, John A.; Jordan, Bret Cc: JG on CTI-TC; Chris O'Brien; [email protected] Subject: RE: [cti-stix] Proposal - Top Level Relationship Object John, Have you considered the case where an analyst wants to simply say that this collection of objects seems to be related? Imagine a case where you think that a bunch of things (incidents/observables/etc) are related, but you have not yet done the in depth analysis to understand the nature of their relationship. I had this sort of generic grouping of things in mind for a top level relationship object. In this case, I don’t think you could always have a From and To IDREF. You might just have a collection of IDREFs. Jon ============================================ Jonathan O. Baker J83D - Cyber Security Partnerships, Sharing, and Automation The MITRE Corporation Email: [email protected] From: [email protected] [ mailto:[email protected] ] On Behalf Of Wunder, John A. Sent: Tuesday, July 28, 2015 4:15 PM To: Jordan, Bret < [email protected] > Cc: JG on CTI-TC < [email protected] >; Chris O'Brien < [email protected] >; [email protected] Subject: Re: [cti-stix] Proposal - Top Level Relationship Object Sure...personally I would do this, which is almost identical to what we do now (other than being at the top level rather than within an object): Relationship ID (for the relationship) [required] From IDREF [required] To IDREF [required] Relationship Qualifier [required] Confidence [optional] I'm undecided on whether information source information belongs in the STIX data model at all. By virtue of being in the data model it means someone is asserting it so it's impossible to verify. Digital signatures or something else out of the data model (relying on TAXII, etc.) seem like a better approach to me. But I don't have strong opinions on this and if we do include information source in the data model I would add that here. John From: Jordan, Bret Date: Tuesday, July 28, 2015 at 4:05 PM To: Wunder, John A. Cc: JG on CTI-TC, Chris O'Brien, [email protected] Subject: Re: [cti-stix] Proposal - Top Level Relationship Object Great... Now we are discussing it... Please spell out what that would look like. Thanks, Bret Bret Jordan CISSP Director of Security Architecture and Standards Office of the CTO Blue Coat Systems PGP Fingerprint: 63B4 FC53 680A 6B7D 1447 F2C0 74F8 ACAE 7415 0050 Without cryptography vihv vivc ce xhrnrw, however, the only thing that can not be unscrambled is an egg. On Jul 28, 2015, at 13:51, Wunder, John A. < [email protected] > wrote: No directionality or description/qualifier? It seems like you want to be able to say *what* a relationship is describing and also which direction it goes in. I.e. TTP malware is variant of other TTP malware vs. TTP malware is same as other TTP malware given a different name by a different vendor From: < [email protected] > on behalf of Jordan, Bret Date: Tuesday, July 28, 2015 at 3:41 PM To: JG on CTI-TC Cc: Chris O'Brien, [email protected] Subject: Re: [cti-stix] Proposal - Top Level Relationship Object I see the relationship object being pretty simple and straight forward: Relationship IDREF (1-n) Source Confidence Thanks, Bret Bret Jordan CISSP Director of Security Architecture and Standards Office of the CTO Blue Coat Systems PGP Fingerprint: 63B4 FC53 680A 6B7D 1447 F2C0 74F8 ACAE 7415 0050 Without cryptography vihv vivc ce xhrnrw, however, the only thing that can not be unscrambled is an egg. On Jul 28, 2015, at 13:16, JG on CTI-TC < [email protected] > wrote: Chris: You are not going insane...we are all dealing with these same issues. Some of the more recent discussions (after you made this post) with respect to 'Sightings' seem to make a lot of sense to me...that is, to push the Sighting functionality further down in the data model...That is, down to the CybOX level... And I think we need to think about the Relationship object with respect to 'Communities of Interest'... For example, a malware research Community of Interest that is using Indicator, Observable, TTP and ExploitTarget may seek to express Relationships in a way that shows the Static and Behavioral characteristics of the malware (deep in the data model and at a very refined level of granularity) ...Whereas an Incident Response Community of Interest that is using Indicator, Incident and CourseOfAction may need the Relationship object defined in a separate way.... that is, one that is more tied to actionable intelligence which may then tie into ExploitTarget, ThreatActor, and Campaign...which then becomes of interest to a law enforcement Community of Interest. Of course... handling this may take us back into the debate on Profiles... Jane Ginn CTIN On 7/27/2015 3:44 AM, Chris O'Brien wrote: For what it's worth, from me, I think this would be pretty huge (coupled with the sightings object as well). As an analyst trying to identify useful data for my customers on large data sets, I'm interested in being able to produce top-level, automated assessments on data quality of feeds/dbs of stix data, and one of the ways that I'd suggest that a specific data point is of a 'high quality' is if it has multiple relationships and/or sightings. Add in to that the ability to rank producers, and even analytical assertion confidence, and you've got all the makings of a an algorithm for a heuristic grading scheme that could feed something even more awesome...like a machine learning project that can conduct threat pattern detection... As you say, Bret, this also gives scope for those relationships to have their own concept of 'quality' based on their related analytical assertions / confidence. I'd perhaps throw in to the discussion that it may not need to be a standalone object in its own right - we're currently experimenting with using the existing stix architecture relationships (with a little extra meta data) to achieve the desired effect, but it gets messy quickly and direct references to the relationships are by-way-of the object that they sit on (then you ask...which end of the relationship is the 'master' for that relationship, or must they both be updated when a change is made...what happens if one of them isn't in your namespace, etc, etc). Jimmy-rigging solutions to those issues feels feasible, but messy, prescriptive and makes anyone with a coding background have a little cry to themselves. It's something we're having to think about here at the moment - just wanted to mention that it's still possible and would be less impactful to existing deployments. Cheers, cob PS: If anyone else is looking in to this sort of heuristic / predictive / minority report-esque implementation, it'd be good to hear from you. If only to confirm that I'm not going completely insane.