Widespread ransomware attack likely hit ‘thousands’ of companies on eve of long weekend

But because Kaseya’s software is used by large IT companies that offer contract services to hundreds of smaller businesses, the hack could have spread to thousands of victims. Kaseya told all of its nearly 40,000 customers to disconnect their Kaseya software immediately. The cybersecurity firm Huntress Labs said it had tracked 20 IT companies, known as managed-service providers, that had been hit. More than 1,000 of those companies’ clients, mostly small businesses, also had been affected by the hack, Huntress Labs said on Reddit.