Flagstar Bank is warning customers that their personal information, including social security numbers, may have been stolen in a ransomeware attack. The company said the hack was discovered in January but customers said they were recently notified. Local 4 learned that the thieves got social security numbers as well home addresses not only of customers but also possibly employees. Flagstar has reached out to customers impacted and offering a credit monitoring service. The one-click Microsoft tool was created to protect against cyberattacks and to scan systems for compromises and fix them.