Malware infection routes

Malware can reach a device by more than one route. A route is the path a malicious program takes to get onto your system or to start running on it.

Infected removable storage

Removable storage devices such as memory cards and portable hard drives can carry malware from one device to another. The malware may be hidden in a file or program stored on the drive. When you connect the device and open that file, the malicious code can transfer to your computer and run. No internet connection is needed for this route, so an infected drive can still spread malware on a network that is otherwise well protected.

Unsecured or open Wi-Fi

An unsecured or open Wi-Fi network has no password or security key, so anyone nearby can join it. Because the network is not protected, a malicious device on it could intercept data you send, redirect you to a fake page or swap a file you download for an infected one. You cannot easily tell who else is connected.

Untrusted websites and downloaded files

Untrusted websites are sites you do not know or trust. They may offer free software, game add-ons or tools that hide malware inside the download. When you visit the site or download and run the file, the malicious program can install itself. For example, a pop-up advert might offer a free drawing app; the installer also copies harmful code onto your device.