The company has taken part of its website offline after an independent analyst said the site may have been hacked.
Equifax - whose multimillionaire CEO chose to set sail from the company weeks after the announcement that, under his watch, the information of 143 million Americans was obtained by hackers - was sending visitors of its website to the completely bogus software update.
"We are aware of the situation identified on the equifax.com website in the credit report assistance link", Equifax spokesman Wyatt Jefferies said in an email.
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The firm said it took down the link for credit report assistance temporarily "out of an abundance of caution".
The possibility of another malicious hack at Equifax comes just a week after the company's former chief executive, Richard Smith, was grilled by angry lawmakers over a massive data breach that may have compromised the sensitive information of as many as 145 million people.
Equifax's stock plunged at the news of the latest breach, a Wall Street Journal reporter noted on Twitter.
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Previously, North Korean hackers were suspected of having a hand in launching cyberattacks against South Korea's air force and military.
Equifax has taken down a customer service web page after reports that it was serving up bogus Adobe Flash installation dialogs laden with malware, Reuters reports.
If suffering one of the worst hacks in history wasn't enough, Equifax may have been attacked yet again. In many cases, even more personal data was exposed, including driver's license and credit card numbers. Equifax first disclosed that breach in September.
Money expert Clark Howard says rather than waiting on Equifax to get itself together, consumers should be proactive and do what they can to protect themselves from identity fraud.
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Besides, they demanded that the Consulate General in San Francisco should be closed and the consul general's residence emptied. Entrance doors to the buildings were broken, while the buildings themselves were searched.