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Subject: Re: [EXT] Re: [cti-stix] Small changes from 2.0 - 2.1 - dates on relationships
Agreed that we should be clear on what we are trying to communicate. Valid_until suggests to me that somehow the relationship will expire after X hours/mins/days.
Last_seen suggests to me that the last time the reporting entity saw the connection between those entities. I prefer the later because it’s a statement in fact whereas valid_until is an estimate by the producer on when they “think” something is no longer connected. That later aspect is subjective at best. Allan From: Bret Jordan <Bret_Jordan@symantec.com> well it depends on what we are saying and what use-case we are trying to solve. If we are saying that this relationship between this Malware and COA for example is only valid for these time frames, then valid_from
and valid_until are the better choice, just like what we did with Indicators. If we are saying that this relationship was seen between these time frames, that seems like a "sighting". Remember Sighting is just a relationship with an extra property and the ability to have them be one-armed
relationships. So what is the use-cases we are trying to solve with this request??? Bret From: cti-stix@lists.oasis-open.org <cti-stix@lists.oasis-open.org> on behalf of Allan Thomson <athomson@lookingglasscyber.com> We’ve used first_seen and last_seen in other objects. I suggest we be consistent with both terminology and semantics of these properties with prior SDOs. Regards Allan From: "cti-stix@lists.oasis-open.org" <cti-stix@lists.oasis-open.org> on behalf of Sean Barnum <sean.barnum@FireEye.com> I could support “valid_from” and “valid_to” Sean Barnum Principal Architect FireEye M: 703.473.8262 E: sean.barnum@fireeye.com From: <cti-stix@lists.oasis-open.org> on behalf of "Wunder, John A." <jwunder@mitre.org> I support this change, which I believe was originally suggested by Allan. You can think of many use cases in real intelligence:
I would say that the big question here is whether we call the fields “valid_from” and “valid_to” or “first_seen” and “last_seen”. I think I have a slight preference for valid_from and valid_to because of some
of the connotations of “last_seen” being present vs. absent. Like if last_seen is not on the object, what does it mean, vs. if last_seen is on the object set to yesterday. Valid_from on the other hand makes it clear that if the producer feels like the relationship
is still valid they don’t provide the field. John From: <cti-stix@lists.oasis-open.org> on behalf of Sarah Kelley <Sarah.Kelley@cisecurity.org> I’m going to be sending a series of emails regarding small changes that have been requested in moving from STIX 2.0 to STIX 2.1. The hope is that these won’t be particularly controversial, but if anyone has
any objections to these changes, please speak up. GITHUB issue #11 (https://github.com/oasis-tcs/cti-stix2/issues/11
) There has been a suggestion to add “first_seen” and “last_seen” properties onto the relationship object. The Relationship object would then look something like this (with the suggested changes highlighted
in yellow): 3.1.2 Properties
Does anyone have any objections to making this change?
Sarah Kelley Senior Cyber Threat Analyst Multi-State Information Sharing and Analysis Center (MS-ISAC) 31 Tech Valley Drive East Greenbush, NY 12061 518-266-3493 24x7 Security Operations Center SOC@cisecurity.org - 1-866-787-4722 This message and attachments may contain confidential information. If it appears that this message was sent to you by mistake, any retention, dissemination, distribution or copying of this message and attachments
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