Over 70 US banks and credit unions affected by Marquis ransomware breach - here's what we know

• Marquis Software Solutions hit by ransomware via SonicWall flaw, affecting 400,000+ customers across 74 banks/credit unions
• Stolen data includes names, SSNs, TINs, financial info, and birth dates; company allegedly paid ransom to prevent leaks
• Victims offered free identity theft protection; attack possibly linked to Akira ransomware exploiting CVE-2024-40766

American fintech company Marquis Software Solutions apparently suffered a ransomware attack and allegedly even paid the attackers not to let the stolen data leak onto the dark web.

Earlier this week, the company filed a new report with Attorney General offices across the states, including Maine, Iowa, and Texas, and reached out to affected clients to notify them about the incident.

As per the reports, the attack took place on August 14, 2025, when crooks broke in through a vulnerability in the SonicWall firewall.