One of the dangerous problems that can take place on your device is virus. It is a program which is designed in such a way that it tends to multiply itself from file to file. A virus can spread at a very fast rate within a computer and can transfer to another computer if an infected file is exchanged from one system to another. Wirelurker, iWorm, CoinThief, etc. some of the dangerous viruses, that can lead to harmful effects on your Mac device.