The HR and payroll software Kronos was hit by a ransomware attack over the weekend.

The parent company UKG said Monday it may take several weeks for the HR tools to return to normal.

Kronos Workforce Central is a suite of software tools used to manage employees including scheduling, clock in/ out, attendance, and payroll. Some businesses are already raising the concern that they may not be able to pay employees until the tools come back online.

Kronos is used by tens of thousands of organizations including half the Fortune 1000. The high-profile HR management tool is used by many city governments including the […]