The theft of an executive account from a major exchange is probably an inside job.

The method isn't actually complicated—there's a gray area in WeChat's verification mechanism. As long as you have the phone number and WeChat ID, and coordinate with a few mutual friends to go through the verification process, the account control can be transferred. It's a game of probability, but the success rate isn't low.

Why say it's someone familiar? Because only people within a close circle would have access to all this information.