Okay, now I don't get what's frigging wrong with some guys hacking wallets with recently listed cryptos and sending eth and transferring them out??? That's a new low, or is it an old trick?
There's a quite old trick, a couple of months old already, I'm not sure if this is the one you are asking about.
The guys post here and there "by mistake" the private key of ETH wallets. The wallets have a good number of tokens and no ETH. As soon as you want to steal from them and you send ETH to have gas, a smart contract sends away that ETH, leaving the "public" wallet again without ETH.
Quite an elaborate scam...