Marketing and Compliance Software Vendor to Banks Breached

Marquis Software Solutions Says Ransomware Group Hit SonicWall Device, Stole Data Mathew J. Schwartz (euroinfosec) • December 3, 2025

Bank and credit union service provider Marquis Software Solutions suffered a data breach that exposed multiple financial institutions' customer details.

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The Plano, Texas-based company, which develops marketing and compliance software, counts over 700 banks and credit unions as customers.

The company said ransomware-wielding attackers gained a foothold in its IT environment after breaching its SonicWall firewall on Aug. 14, which it detected the same day after seeing "suspicious activity on its network."

Investigators found that the attacker may have accessed files containing data stored by Marquis Software on behalf of "present and former business customers," pertaining to their own customers, and that "the incident was limited to Marquis' environment."

Whether attackers stole data stored by Marquis Software isn ...