The photo is a little too blurry to make out identifying features, but based on what I can see, I think this is a stink bug nymph (likely 2nd instar). There are several species of stink bugs in Oregon, this looks like it may be a nymph of Chlorochroa ligata or Banasa dimidiata. You can compare what you saw to the photos in this ODA stink bug guide: https://www.oregon.gov/oda/shared/Documents/Publications/IPPM/StinkBugGuide.pdf. 
Stink bugs have piercing-sucking mouthparts that they use to puncture the skin of the fruit and suck out the juices. Damage in caneberries can include sunken areas on the berries, or distorted and shrivelled fruit. Once they puncture the fruit to feed, rot organisms can enter and cause fruit rot. 
It sounds like the bugs have moved on, but if they return, you can try to vacuum them up or blow them off the plant (light blast from a leaf blower). Remove any weeds or other host plants that they are congregating on. They have a lot of natural predators, so avoid using broad spectrum pesticides if possible. For a list of pesticides registered for use, refer to: https://pnwhandbooks.org/insect/small-fruit/blackberry-raspberry/blackberry-raspberry-stink-bug.