Articles and headlines themselves do not constitute evidence. All we get from your Reuters article is an allegation from the US Government (of Iraq WMD fame), and a denial from the Chinese Government. It's hearsay not evidence. Where is the evidence?

If actual evidence were all over the place, you wouldn't be making this comment.

The fact is the accurately attributing expert cybercrime is extremely difficult and anyone that implies otherwise is making a fool out of you.