[client] Handle platforms args from mitre extension (#8245)

Author: Gwendoline-FAVRE-FELIX

pycti/entities/opencti_indicator.py

@@ -401,6 +401,12 @@ def import_from_stix2(self, **kwargs):
                 stix_object["x_opencti_workflow_id"] = (
                     self.opencti.get_attribute_in_extension("workflow_id", stix_object)
                 )
+            if "x_mitre_plateforms" not in stix_object:
+                stix_object["x_mitre_plateforms"] = (
+                    self.opencti.get_attribute_in_mitre_extension(
+                        "platforms", stix_object
+                    )
+                )
 
             return self.create(
                 stix_id=stix_object["id"],