Regin is a type of malware. Malware is software that is created to damage or gain access to the data on computers, networks, or other digital devices. Regin is a particularly sneaky type of malware because it can be hard to detect. It can infect computers and devices, then cause them to behave in unexpected ways, such as sending out spam emails or collecting secret information. Regin is a sneaky type of malware because it hides itself, making it difficult to recognize it on a computer or device.