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updated 12/26/2011 1:51:17 PM ET 2011-12-26T18:51:17

The loose-knit hacking movement "Anonymous" claimed to have stolen thousands of credit card numbers and other personal information belonging to clients of U.S.-based security think tank Stratfor. One hacker said the goal was to pilfer funds from individuals' accounts to give away as Christmas donations, and some victims confirmed unauthorized transactions linked to their credit cards.

Anonymous boasted of stealing Stratfor's confidential client list, which includes entities ranging from Apple Inc. to the U.S. Air Force to the Miami Police Department, and mining it for more than 4,000 credit card numbers, passwords and home addresses.

Austin, Texas-based Stratfor provides political, economic and military analysis to help clients reduce risk, according to a description on its YouTube page. It charges subscribers for its reports and analysis, delivered through the web, emails and videos. The company's main website was down, with a banner saying the "site is currently undergoing maintenance."

Proprietary information about the companies and government agencies that subscribe to Stratfor's newsletters did not appear to be at any significant risk, however, with the main threat posed to individual employees who had subscribed.

"Not so private and secret anymore?" Anonymous taunted in a message on Twitter, promising that the attack on Stratfor was just the beginning of a Christmas-inspired assault on a long list of targets.

Anonymous said the client list it had already posted was a small slice of the 200 gigabytes worth of plunder it stole from Stratfor and promised more leaks. It said it was able to get the credit card details in part because Stratfor didn't bother encrypting them — an easy-to-avoid blunder which, if true, would be a major embarrassment for any security-related company.

Fred Burton, Stratfor's vice president of intelligence, said the company had reported the intrusion to law enforcement and was working with them on the investigation.

Stratfor has protections in place meant to prevent such attacks, he said.

"But I think the hackers live in this kind of world where once they fixate on you or try to attack you it's extraordinarily difficult to defend against," Burton said.

Hours after publishing what it claimed was Stratfor's client list, Anonymous tweeted a link to encrypted files online with names, phone numbers, emails, addresses and credit card account details.

"Not as many as you expected? Worry not, fellow pirates and robin hoods. These are just the 'A's," read a message posted online that encouraged readers to download a file of the hacked information.

The attack is "just another in a massive string of breaches we've seen this year and in years past," said Josh Shaul, chief technology officer of Application Security Inc., a New York-based provider of database security software.

Still, companies that shared secret information with Stratfor in order to obtain threat assessments might worry that the information is among the 200 gigabytes of data that Anonymous claims to have stolen, he said.

"If an attacker is walking away with that much email, there might be some very juicy bits of information that they have," Shaul said.

Lt. Col. John Dorrian, public affairs officer for the Air Force, said that "for obvious reasons" the Air Force doesn't discuss specific vulnerabilities, threats or responses to them.

"The Air Force will continue to monitor the situation and, as always, take appropriate action as necessary to protect Air Force networks and information," he said in an email.

Miami Police Department spokesman Sgt. Freddie Cruz Jr. said that he could not confirm that the agency was a client of Stratfor, and he said he had not received any information about a security breach involving the police department.

Anonymous also linked to images online that it suggested were receipts for charitable donations made by the group manipulating the credit card data it stole.

"Thank you! Defense Intelligence Agency," read the text above one image that appeared to show a transaction summary indicating that an agency employee's information was used to donate $250 to a non-profit.

One receipt — to the American Red Cross — had Allen Barr's name on it.

Barr, of Austin, Texas, recently retired from the Texas Department of Banking and said he discovered last Friday that a total of $700 had been spent from his account. Barr, who has spent more than a decade dealing with cybercrime at banks, said five transactions were made in total.

"It was all charities, the Red Cross, CARE, Save the Children. So when the credit card company called my wife she wasn't sure whether I was just donating," said Barr, who wasn't aware until a reporter with the AP called that his information had been compromised when Stratfor's computers were hacked.

"It made me feel terrible. It made my wife feel terrible. We had to close the account."

Wishing everyone a "Merry LulzXMas" — a nod to its spinoff hacking group Lulz Security — Anonymous also posted a link on Twitter to a site containing the email, phone number and credit number of a U.S. Homeland Security employee.

The employee, Cody Sultenfuss, said he had no warning before his details were posted.

"They took money I did not have," he told The Associated Press in a series of emails, which did not specify the amount taken. "I think 'Why me?' I am not rich."

But the breach doesn't necessarily pose a risk to owners of the credit cards. A card user who suspects fraudulent activity on his or her card can contact the credit card company to dispute the charge.

Stratfor said in an email to members, signed by Stratfor Chief Executive George Friedman and passed on to AP by subscribers, that it had hired a "leading identity theft protection and monitoring service" on behalf of the Stratfor members affected by the attack. The company said it will send another email on services for affected members by Wednesday.

Stratfor acknowledged that an "unauthorized party" had revealed personal information and credit card data of some of its members.

The company had sent another email to subscribers earlier in the day saying it had suspended its servers and email after learning that its website had been hacked.

One member of the hacking group, who uses the handle AnonymousAbu on Twitter, claimed that more than 90,000 credit cards from law enforcement, the intelligence community and journalists — "corporate/exec accounts of people like Fox" News — had been hacked and used to "steal a million dollars" and make donations.

It was impossible to verify where credit card details were used. Fox News was not on the excerpted list of Stratfor members posted online, but other media organizations including MSNBC and Al-Jazeera English appeared in the file.

Anonymous warned it has "enough targets lined up to extend the fun fun fun of LulzXmas through the entire next week."

The group has previously claimed responsibility for attacks on credit card companies Visa Inc. and MasterCard Inc., eBay Inc.'s PayPal, as well as other groups in the music industry and the Church of Scientology.

Copyright 2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Video: Anonymous goes on hacking spree

  1. Transcript of: Anonymous goes on hacking spree

    LESTER HOLT, anchor: Now to a massive security breach at a security firm whose laundry list of big-name clients includes Apple and the US military . The hacking group known as Anonymous says it's stolen thousands of credit card numbers and other personal information belonging to the firm's clients, but instead of going on a buying binge, you might be surprised by what they've apparently done. We get the details from our justice correspondent Pete Williams .

    PETE WILLIAMS reporting: The company called Stratfor based in Austin , Texas , helps clients shield themselves from risk. Tonight it's scrambling to protect itself. Its website now contains only a brief corporate understatement that it's, quote, undergoing maintenance. Hackers from the group Anonymous claim they stole thousands of credit card numbers and other personal information from the company and used it to make donations to charity. Some were corporate and government clients, but individual subscribers to Stratfor 's service were also among the victims, including this former employee of the Texas Department of Banking .

    Mr. ALLEN BARR (Hacking Victim): In this instance they're taking it from individuals who take -- you know, they could have ruined our Christmas . They could have ruined our lives.

    WILLIAMS: He says the hackers tried to steal $700 from his account, giving 200 of it as a donation to the Red Cross . In a widely circulated statement, the group says there's, quote, "plenty more havoc in store for the rest of the week" and calls for the release of Army Private Bradley Manning , accused of passing on thousands of classified government documents to WikiLeaks , the website that the hacker group Anonymous has sought to aid in the past.

    Mr. EVAN KOHLMANN (NBC Terrorism Analyst): I think the lesson here is for companies that do have this kind of sensitive information, now is the time to secure it. It's no longer enough to simply say, 'Well, it might not happen.'

    WILLIAMS: Tonight Stratfor says it's putting systems in place to prevent something like this from happening again. The hackers say the company should have stored the credit card numbers in encrypted files in the first place . Pete Williams , NBC News, Washington.

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