Hackers have infected the American Cancer Society’s online store with malware, according to a recently published tech blog.

Security researcher Willem de Groot found the malware last week, according to TechCrunch. The code was designed to steal credit card numbers from the page and was disguised as legitimate analytics code to conceal it from discovery.

The attack was made by a group called Magecart, a domain registered in Moscow, which is known for stealing credit card numbers to sell on the dark web.

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De Groot notified the organization when the code was discovered last Thursday, Oct. 24, by calling the American Cancer Society’s anti-fraud hotline.

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The organization, which is headquartered in Atlanta, has not released a statement on the breach, and it is not known how many online store customers were affected.

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