Fintech company Marquis attributes its August 2025 ransomware attack to a prior breach at firewall provider SonicWall, which exposed firewall configuration files and credentials stored in SonicWall's cloud backup service. The attack resulted in theft of customer personal and financial data, including Social Security numbers, affecting hundreds of thousands of individuals. Marquis plans to seek compensation from SonicWall for breach-related expenses, while SonicWall disputes the connection and requests evidence. SonicWall initially claimed fewer than 5% of customers were affected but later admitted all customers using its cloud backup service had their firewall configurations accessed.
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