QuickBooks files are accounting data files used by the QuickBooks software. Depending on the business and how its books are maintained, they may contain payment histories, vendor details, invoices, revenue records, and other financial information.
In a cyber incident, exposed accounting files can help criminals attempt payment fraud, impersonate vendors, target employees with convincing phishing, or misuse sensitive business information. Defenders should treat these files as confidential: restrict access, use strong authentication, encrypt backups and transfers, and verify unexpected requests to change payment details. If files may have been exposed, preserve evidence and assess their contents before deciding who could be affected.