Is that even possible?
The official story is that WaltonChain underwent an emergency hardfork after suffering a "coordinated attack" due to a bug exploit.
The first mention of the attack was posted on Reddit mentioning a "99.99% Attack". You can read more about it in a third party post-mortem.
Thankfully, the attack has been mitigated via a hard fork which fixed the issue.
Despite suffering a bug exploit and overwhelming attack, there is still strong from the Waltonchain community. The price did not slump following the hack, unlike most previous blockchain hacks.