CTIXView source docs
Custom Objects
Custom Objects are custom STIX objects that provide additional context to any threat intel. Custom Objects characterize threat data components that are not described by STIX components. The application allows you to create custom objects that can be mapped with custom attributes and are used while creating custom intel packages in the application. Custom objects can be organization or sector-specific. Some examples include Payment Card information, IMEI numbers, SIM Card numbers, and so on.
For more information, see Custom Objects.