Yes, but e.g. data tunneled over DNS is pretty hard to detect. I'm sure the Chinese government could spare some (a lot of) domain names. Also note that a netwo

Yes, but e.g. data tunneled over DNS is pretty hard to detect. I'm sure the Chinese government could spare some (a lot of) domain names. Also note that a network card with DMA access has pretty much free reign of the computer. However, all this is a lot more complicated than just hacking the latest Windows hole; I doubt it would be cost-effective.