Independent security analyst Randy Abrams found that part of Equifax's website was under the control of attackers trying to trick visitors into installing fraudulent Adobe Flash updates that could infect computers with malware, Ars Technica first reported.
Equifax shares dropped as much as 3.5 percent Thursday after it said it has disabled one of its customer help online pages and is investigating another possible cyberbreach.
Equifax Canada spokesperson Tom Carroll says the company is aware of the situation identified on its US parent company's website related to its "credit report assistance" link.
Equifax said that, out of an abundance of caution, the Atlanta company has taken the affected page offline, and it's looking into the matter.
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The web page in question now displays an error message that tells visitors "the website is now down for maintenance". To serve the adware up to visitors, the hackers appear to have redirected them from Equifax's site to shady web pages that host the malicious software. The latest claims reveal that after one of the largest data breaches ever, Equifax still may not have learned its lesson about providing proper security for its customers.
The breach led to the retirement of Equifax chief executive Richard Smith, who has remained as a consultant to the company during the investigation.
After that breach, the company faced seething criticism from consumers, regulators and lawmakers over its handling of that incident.