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Cool hack: Man exploits random deposit verification flows to steal $50,000

"A California man has been indicted for an inventive scheme that
allegedly siphoned $50,000 from online brokerage houses E-trade and
Schwab.com in six months — a few pennies at a time.

Michael Largent, of Plumas Lake, California, allegedly
exploited a loophole in a common procedure both companies follow when a
customer links his brokerage account to a bank account for the first
time. To verify that the account number and routing information is
correct, the brokerages automatically send small "micro-deposits" of
between two cents to one dollar to the account, and ask the customer to
verify that they've received it. "

"Largent allegedly used an automated script to open 58,000 online
brokerage accounts, linking each of them to a handful of online bank
accounts, and accumulating thousands of dollars in micro-deposits.

I know it's only May, but I think the competition for Threat Level's Caper of the Year award is over.

Largent's script allegedly used fake names, addresses and
Social Security numbers for the brokerage accounts. Largent allegedly
favored cartoon characters for the names, including Johnny Blaze, King
of the Hill patriarch Hank Hill, and Rusty Shackelford. That last name
is doubly-fake — it's the alias commonly used by the paranoid
exterminator Dale Gribble on King of the Hill. "

This is a great example of a business flaw attack.

Story Link: http://blog.wired.com/27bstroke6/2008/05/man-allegedly-b.html