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REVEALED: Details of the Mailchimp Breach Hack Show

Mailchimp Breach

Mailchimp, the veteran email marketing platform, has confirmed that hackers used an internal tool to steal data from more than 100 of its clients—with the data being used to mount phishing attacks on the users of cryptocurrency services. The Mailchimp breach was confirmed to the press by Mailchimp itself but it had come to light over the weekend when users of the Trezor hardware cryptocurrency wallet reported being targeted by sophisticated phishing emails. MailChimp has also confirmed that their service has been compromised by an insider targeting crypto companies.

Mailchimp Breach

In a statement, Mailchimp CISO Siobhan Smyth said that the company had become aware of the breach on March 26th when it detected unauthorized access of a tool used by the company’s customer support and account administration teams. Although Mailchimp deactivated the compromised employee accounts after learning of the breach, the hackers were still able to view around 300 Mailchimp user accounts and obtain audience data from 102 of them, Smyth said.

“We sincerely apologize to our users for this incident and realize that it brings inconvenience and raises questions for our users and their customers,” Smyth said. “We take pride in our security culture, infrastructure, and the trust our customers place in us to safeguard their data. We’re confident in the security measures and robust processes we have in place to protect our users’ data and prevent future incidents.”

Details of the Mailchimp Breach However, details of the Mailchimp breach hack show that the compromise of Mailchimp’s internal tools was just one piece in a bigger puzzle. As Bleeping Computer reports, one of the stolen email lists was used to send a fake data breach notification to Trezor customers, prompting them to download a new version of the Trezor Suite desktop application. In fact, the email directed users to a phishing site that hosted a fake version of the application, designed to steal the seed phrase that would allow hackers to gain total control over a user’s cryptocurrency wallet. It’s currently unclear whether any Trezor users had funds stolen by the attack. In a blog post, Trezor said that the attack was “exceptional in its sophistication and … clearly planned to a high level of detail,” with the cloned version of the Trezor Suite app presenting a realistic functionality to anyone who installed it. Mailchimp’s analysis has concluded that the attackers focused on obtaining data from users in the cryptocurrency and finance sectors.

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