The bank uses Proactive Risk Manager to establish a threshold for the number of transactions performed over a specified period of time on its networks for a specified dollar amount. If it sees too many big transactions in a short amount of time, red flags are raised.
The fraudulent activity observed on Feb. 10 kept up through the next day, when Citizens identified the Stop & Shop store in Cranston, R.I., as a common point of compromise. Another common point of compromise was the Stop & Shop in Coventry, R.I. In other words, all of the account numbers committing fraud on Citizens' network in California had recently been used to make purchases at that Stop & Shop thousands of miles away. "We alerted our corporate security folks that there might be skimmers at those locations," Macheska said. As it turns out, the guilty parties were traveling from California to New England every week to plant and swap out skimmer devices and collect customer data.
Once Macheska and his team were able to determine the point of compromise, they were able to query Citizens' database for all of the cards the bank had issued that had been used at those Stop & Shop locations. "We can then monitor those cards or reissue them," he said. Citizens reissued thousands of cards as a result of the skimming operation.
Detecting payment card fraud is neither foolproof nor instantaneous, but ACI Worldwide, a software maker that had until recently been known as Transaction Systems Architects, is moving in the direction of both improved accuracy and performance. "You're generally looking for a needle in a haystack when you're trying to find fraudulent transactions," Derren Jones, ACI Worldwide's director of product management for fraud and risk management, told InformationWeek. "You could be getting 100 or 1,000 transactions per second, depending up on how large you are." The company Monday introduced an online fraud-reduction calculator to help companies determine the effectiveness of their current fraud-prevention systems.
The key to keeping a lid on the Stop & Shop scam was early detection. "Stop & Shop's losses were not as bad as they could have been," Macheska said. "If we didn't have some sort of detection system in place, we would have been buried as a result of [the] Stop & Shop" data theft.
Stop & Shop's security response was low-tech but effective nonetheless. The company's stores began bolting down their point-of-sale terminals so that they couldn't be removed by customers.
Citizens is now looking to implement real-time fraud notification through ACI's Proactive Risk Manager system. "With a real-time rule, we can deny a transaction before fraud occurs," Macheska said. "You're now dealing with the authentication process. That can cut down the amount of money that's taken to begin with."