We wouldn't know if China, Russia or whoever could identify specific US operators, only the US plays silly indictment games like this.
https://docs.google.com/spreadsheets/d/1-YhLDDrFIPlVVXG3EkpA...
Recently there's been a lot of speculation that Shadow Brokers were in fact the "second source". That may or may not be true.
>I mean it's pretty obvious the Shadow Brokers were aligned with foreign policy interests of the Russian government
It's really not. Unless everything anti-US fits that mould, but then we'd have a plenty of other governments to suspect too.