It looks like the hacker has been dumping XEM, but is nearly out. It's all getting bought up. Huge volumes have moved from richlist, and eventually into Bittrex and other exchanges in last 24hrs.
And while I was typing this, I paused to check again, and it looks like ALL the hackers XEM has moved into exchanges.

Once we finish chewing through his sell walls, we should have clear skies again.
HODL Gang!