Hackers are targeting the burgeoning population of third-party sellers on Amazon.com, using stolen credentials to post fake deals and steal cash.

Attackers have recently changed the bank-deposit information on Amazon accounts of active sellers to steal tens of thousands of dollars from each.

The fraud stems largely from e-mail and password credentials stolen from previously hacked accounts and then sold on the dark web.

C J Rosenbaum, a lawyer who represents Amazon sellers, said that more than a dozen clients had contacted him, saying they had been hacked. A number of them lost about half of their monthly sales of $15,000 to $100,000. They are – natch – asking Amazon for their money back.