There's a new criminal tactic involving hacking an e-mail account of a company that handles high-value transactions and diverting payments. Here it is in real estate:
> The scam generally works like this: Hackers find an opening into a title company's or realty agent's email account, track upcoming home purchases scheduled for settlements -- the pricier the better -- then assume the identity of the title agency person handling the transaction. > > Days or sometimes weeks before the settlement, the scammer poses as the title or escrow agent whose email accounts they've hijacked and instructs the home buyer to wire the funds needed to close -- often hundreds of thousands of dollars, sometimes far more -- to the criminals' own bank accounts, not the title or escrow company's legitimate accounts. The criminals then withdraw the money and vanish.
Here it is in fine art:
> The fraud is relatively simple. Criminals hack into an art dealer's email account and monitor incoming and outgoing correspondence. When the gallery sends a PDF invoice to a client via email following a sale, the conversation is hijacked. Posing as the gallery, hackers send a duplicate, fraudulent invoice from the same gallery email address, with an accompanying message instructing the client to disregard the first invoice and instead wire payment to the account listed in the fraudulent document. > > Once money has been transferred to the criminals' account, the hackers move the money to avoid detection and then disappear. The same technique is used to intercept payments made by galleries to their artists and others. Because the hackers gain access to the gallery's email contacts, the scam can spread quickly, with fraudulent emails appearing to come from known sources.
I'm sure it's happening in other industries as well, probably even with business-to-business commerce.
EDITED TO ADD (11/14): Brian Krebs [wrote about this in 2014.