Modus operandi: Sally, Simon and Bud walk into a toy store. Sally and Simon roam the aisles, while Bud waits in line to check out. When Bud is at the register, Simon comes running up to the clerk, screaming that his wife has fainted. As Sally and Simon distract the sales clerk, Bud switches the credit card reader at the register with a modified one of his own, says FICO's Fraud Chief Mike Urban. For the next week, the sales clerk unwittingly collects credit card data on the modified reader until the trio returns, takes back the modified reader and restores the original terminal.

Known whereabouts: The trio will hit other retailers and restaurants, but sometimes the threesome will instead be a duo or a solo criminal.