I wonder what backdoor hackers found, because if it is not an exchange bug, ETH may expect further price drops.
It is unlikely the backdoor is on the Ethereum part, if it so, the news and the lost fund would be so much bigger. It is safe to say that it is just how bad that exchange operated as a result, their customer funds getting stolen. Yet again a time to reiterate of "not your keys, not your coins".
Looking at their Twitter, looks like there is an update regarding the hack:
Information source Incident update: At 11:23 PM CET on Jan. 9th 2022, LCX’s Technology team detected unauthorized access of one crypto wallet. A total of approx. 7.94M USD of crypto assets were stolen. 0.7M USD have been frozen. All other LCX wallets are not impacted.
Hot Wallet Incident Report