Fixed it?
Although it's interesting to think about. Actual government retaliation would/could be seen as war provocation, especially if China holds on to any plausible deniability. Cyber warfare is currently very hard to prove, but even harder to hold accountable for. Even with DPRK, and our little shut-down-the-"internet" quiet retaliation thing that happened a few months back, North Korea still disavows responsibility. I imagine holding China actually responsible (in the way where it is recognized and acknowledged in the international community) is almost impossible... And thus we would be seen as the aggressors.