1. A computer-implemented method for using USB device descriptors to identify computing environments, at least a portion of the method being performed by a computing device comprising at least one processor, the method comprising: detecting a set of USB devices connected to the computing device in a computing environment; obtaining a USB device descriptor for each USB device within the set of USB devices connected to the computing device; creating an environmental signature for the computing environment that identifies the computing environment based at least in part on the USB device descriptors; wherein creating the environmental signature for the computing environment comprises: creating a hash of each USB device descriptor; storing the hashes of the USB device descriptors in the environmental signature for the computing environment.