Marquis: Ransomware gang stole data of 672K people in cyberattack

Marquis, a Texas financial-services firm, disclosed an August 14, 2025 ransomware attack after threat actors compromised a SonicWall firewall, stealing personal and financial data for about 672,075 individuals and causing disruptions at 74 U.S. banks; the company later linked the incident to a broader SonicWall breach, faced consumer class actions, and filed a lawsuit against SonicWall alleging negligence.