It was North Korea (as a proxy) backed by CHINA — who is the real culprit behind many of the cyber-attacks against the USA at all levels of its infrastructure. China is getting ready for a real war, and this is just a small part of it.
Who could it be? Tel Aviv,Russians,Ukranians,mid-easters, independent anarchists? The spin of NK as China’s errant step-child is laughable. But who is to blame? Beats me.