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Target: 40 million accounts may be involved in massive data breach; Secret Service investigates

8:05 AM, Dec 19, 2013   |    comments
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(USA TODAY/AP) -- Target says about 40 million credit and debit card accounts may have been affected by a data breach.

The chain said Thursday that the accounts may have been impacted between Nov. 27 and Dec. 15.

The Minneapolis company said it immediately told authorities and financial institutions once it became aware of the breach and that it is teaming with a third-party forensics firm to investigate the matter.

Target Corp. said that customers who made purchases at its U.S. stores during the impacted period and suspected unauthorized activity should call them at 866-852-8680.

Target has 1,797 U.S. stores and 124 in Canada.

Meanwhile the Secret Service has confirmed to USA TODAY that it is investigating the data breach.

"The Secret Service will confirm it is investigating the incident at Target," spokesman Brian Leary said in a telephone interview Wednesday night. "We don't have any further comment because it's an ongoing investigation."

The potential breach began around Black Friday, the day after Thanksgiving and the busiest shopping day of the year, according to the Krebs on Security website. The breach involves the theft of information stored on the magnetic stripe on the backs of cards used at nearly all of Target's stores around the country, Krebs reports.

KrebsOnSecurity.com is the site of Brian Krebs, a national computer security expert and former Washington Post reporter.

An expert with a global firm that helps companies respond to and mitigate breaches said while he could not address the Target situation specifically, many companies - large are small - are typically underprepared when they face a breach.

Most important is that the potential breach be addressed quickly, to help get information out to those affected and to regulators, to bring in the right experts to address the breach (such as forensics experts who can stop cyber attacks) and to help preserve the public's trust in the company, said Mike Donovan, Global Focus Group Leader for Beazley Breach Response, headquartered in London.

"We see breaches across all sizes of companies," said Donovan, who is based in San Francisco. "You see the stories about the big ones in the news, but breaches are affecting companies all across the board."

Beazley recently responded to its 1000th breach and the company has seen a "significant number" of large breaches in the last four or five years, Donovan said.

It happens all the time, every day, with retailers, health care organizations, schools and other operations, he said.

"Any company that handles personal data is vulnerable," Donovan said.

The potential breach does not appear to involve online purchases, Krebs reports. It appears the type of data stolen would allow thieves to create counterfeit credit cards and, if pin numbers were intercepted, would also allow thieves to withdraw cash from ATM machines, according to Krebs.

Visa did not respond to e-mails or telephone messages left with its corporate office.

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