It looks like you’ve found yourself a marmorated stink bug. They are probably foraging indoors to overwinter during this cold season. These stink bugs are attracted to warmth and light or bright colors. You will need to do a thorough perimeter treatment and close off any openings in which these pests may be foraging in from. You can visit PestMall.com (Stink Bug Control) for more information.
as tempting as it may be. dont crush them. if you have a shop vac you can use stockings and run the leg peace down the vacuum hose. then tie the top off around the tip of the hose with a rubber band and suck them up then remove them from the home. this works great if you have high numbers in the house. you can also use warm water and soap in a bowl. hold it close to them and they will fall in.