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Sighting level

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Alexandre Dulaunoy 2017-02-14 22:26:45 +01:00
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_posts/2017-02-16-Sighting-The-Next-Level.md
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Sighting is an [endless topic of discussion](https://lists.oasis-open.org/archives/cti-stix/201508/msg00019.html). This is a required feature especially when information or indicators are regularly shared to gather feedback from users of the shared information. Adequate sightings can be an incredible source of information in order to describe the life-time of an indicators, its evolution and especially to ensure the understanding among a group of users using the information to detect, mitigate or block in their infrastructures malicious activities. The potential is huge and can be a significant gain for organised communities of infosec professionals sharing information or even a requirement for any advanced algorithms ranging from machine learning or reinforcement learning. But to reach such state of feedback loop, you require a functional model of sighting. Sighting is an [endless topic of discussion](https://lists.oasis-open.org/archives/cti-stix/201508/msg00019.html). This is a required feature especially when information or indicators are regularly shared to gather feedback from users of the shared information. Adequate sightings can be an incredible source of information in order to describe the life-time of an indicators, its evolution and especially to ensure the understanding among a group of users using the information to detect, mitigate or block in their infrastructures malicious activities. The potential is huge and can be a significant gain for organised communities of infosec professionals sharing information or even a requirement for any advanced algorithms ranging from machine learning or reinforcement learning. But to reach such state of feedback loop, you require a functional model of sighting.
In early April 2016, MISP introduced the support of [sighting via the API](https://circl.lu/doc/misp/automation/index.html#sightings-api) or the UI. This first step was basically to support the existing description of sighting as described in the STIX standard and allow the support via STIX sighting documents or simplified sighting via MISP JSON attributes. This move in MISP allowed us to test sighting at large-scale in existing sharing communities like [the ones operated by CIRCL](https://www.circl.lu/services/misp-malware-information-sharing-platform/). The implementation allowed to have sightings at different levels (events or attributes) with a support of sighting per organisation or per MISP instance level. We had engaging discussions about the current limitation of simple counters: In early April 2016, MISP introduced the support of [sighting via the API](https://circl.lu/doc/misp/automation/index.html#sightings-api) or the UI. This first step was basically to support the existing description of sighting as described in the STIX standard and allow the support via STIX sighting documents or simplified sighting via MISP JSON attributes. This move in MISP allowed us to test sighting at large-scale in existing sharing communities like [the ones operated by CIRCL](https://www.circl.lu/services/misp-malware-information-sharing-platform/). The implementation allowed to have sightings at different levels (attributes or the sighting sum at the event level) with a support of sighting per organisation or per MISP instance level. We had engaging discussions about the current limitation of simple counters:
- Positive and negative sightings cannot be interpreted as it's just a positive counter in the existing standards. Many users asked for a direct feedback regarding their false-positive interpretation of a sighting. - Positive and negative sightings cannot be interpreted as it's just a positive counter in the existing standards. Many users asked for a direct feedback regarding their false-positive interpretation of a sighting.
- An absence of time-to-live reference time that could support advanced expiration model of an indicator. - An absence of time-to-live reference time that could support advanced expiration model of an indicator.