By Robin Sidel 

Criminals are stealing card data from U.S. automated teller machines at the highest rate in two decades, preying on ATMs while merchants crack down on fraud at the checkout counter.

The incidents, in which thieves steal information from debit cards to make counterfeit plastic, are taking place at ATMs that are owned by banks as well as independently owned cash kiosks in shopping centers, convenience stores and restaurants, according to industry executives.

From January to April 9, 2015, the number of attacks on debit cards used at ATMs reached the highest level for that period in at least 20 years, according to FICO, a credit-scoring and analytics firm. The company tracks such incidents through its card- monitoring service for financial institutions that represent more than 65% of all U.S. debit cards.

Debit-card compromises at ATMs located on bank property jumped 174% from Jan. 1 to April 9, compared with the same period last year, while successful attacks at nonbank machines soared by 317%, according to FICO.

"These tremendous spikes in fraud are unprecedented," said John Buzzard, who manages FICO's card-alert service.

The company declined to disclose the total number of such incidents, citing contractual restrictions with its customers.

The incidents come as banks are racing to issue new credit and debit cards with computer chips that make it more difficult for thieves to create counterfeits. However, most ATMs don't yet accept the new technology, though J.P. Morgan Chase & Co. and Bank of America Corp. have recently begun to install the more advanced machines. A Bank of America spokeswoman wouldn't comment on whether they have seen an increase in fraud. A J.P. Morgan spokesman said the bank expects attacks on its ATMs to decline this year due to enhanced security.

Criminals "know there is still vulnerability [at the ATM] and they are trying to capitalize on it," said Owen Wild, director of security marketing at NCR Corp., one of the largest ATM manufacturers.

Merchants are further along in installing equipment to accept the new cards at checkout counters in stores because they will be on the hook to absorb the cost of fraudulent transactions starting in October if they don't have the new equipment in place.

That liability shift won't take place for ATM operators until a year later at the earliest. Card issuers currently have the liability for most fraudulent transactions.

The wave of hacking underscores the financial industry's battle to thwart cybercrime and comes as consumers and banks are reeling from several high-profile data breaches at retailers that have exposed millions of credit cards and debit cards to potential fraud.

Many of the ATM incidents involve a long-established technique in which criminals install devices that capture information from the card's magnetic stripe. The method, called skimming, sometimes also involves a tiny camera that records the cardholder entering a personal identification number.

Criminals use the information to manufacture counterfeit debit cards that can be used to withdraw cash at an ATM or make a purchase in a store or online. The trend is particularly troublesome because thieves can drain a bank account when they have access to cardholder information. Though cardholders aren't typically liable for unauthorized activity on their debit cards, issuing banks may have some discretion to determine if the customer promptly reported the theft.

Consumers also have few ways to prevent an attack because the thievery is often well disguised. Experts advise countermeasures such as covering the keypad with your other hand when entering a PIN and trying to avoid nonbank locations where the ATM is in a hidden location that thieves could easily access without being detected.

Industry executives say that it is difficult to quantify the amount of fraud losses that are associated with such attacks. Tremont Capital Group, a consulting firm that specializes in the ATM industry, predicts that thieves will make at least 1.5 million ATM cash withdrawals this year. Only a portion of the attacks ultimately result in fraudulent transactions. The trend is "alarming, but manageable" because it represents a fraction of total ATM transactions, said Sam Ditzion, chief executive of the Boston-based firm.

A study released last year by the Federal Reserve found that U.S. consumers made 5.8 billion ATM withdrawals in 2012, totaling $687 billion.

Still, the hacking trend is creating headaches for banks and customers whose card information could be at risk.

Earlier this year, New Orleans-based Whitney Bank deactivated 7,100 debit cards and issued new ones to customers after the bank discovered thieves had attached a plastic mold and metal plate to ATM card receptors at several of its ATMs. The bank is a unit of Hancock Holding Co.

"We continue to proactively and vigilantly monitor ATMs and client transactions across our five-state footprint for any potentially fraudulent ATM activity," a spokesman said. The bank, which also operates in Texas, Mississippi, Alabama, and Florida, hasn't seen any additional skimmer attempts.

Laurie Cataldo of Red Bank, N.J., was the recent victim of a debit-card hack. Thieves drained about $85 from her checking account before she noticed, though she doesn't know where they swiped her account information. The bank restored the funds to her account, but the episode forced the 30-year-old radio disc jockey to withdraw cash in advance of a coming trip because the bank froze her account.

Ms. Cataldo now tries to make her ATM transactions more secure by covering the PIN pad with her hand when tapping in her identification number. "Debit cards are so convenient, but then they wind up being way more inconvenient if you get hacked," she said.

Mr. Buzzard of FICO said that the attacks are occurring in traditional hot spots such as southern Florida but also popping up in new places like Albuquerque, N.M., and Memphis, Tenn.

There was also a surge of hacking activity last week that traveled from Philadelphia to New York, he said.

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