How to Spot Malware
Malware is software that’s designed to do something bad like steal data, damage your computer or install additional malware. In the past, malware infections were mostly harmless, but today, cyber criminals use it for extortion, ransomware, cyberwarfare and international espionage.
Malware infections usually happen when you do something that triggers the software to be downloaded onto your device. This could be clicking an infected link in an email or visiting a fraudulent website. Hackers also use peer-to-peer file-sharing services and free software download bundles to embed malicious computer code. Social media-based attacks using messaging apps are also popular.
Once downloaded, malware does whatever it’s programmed to do — for example, stealing your passwords, spying on your activity, encrypting files or installing more malware. To prevent malware from running on your device, check that your operating system is up-to-date. For Windows, see Update & Security in Settings and for Mac, check the App Store.
If your device starts to run slower than usual, this could be a sign of a malware infection. As the software takes over your processing resources, it leaves less power for other functions. You may also notice a lack of available storage space as the malware downloads and stores files on your device.
You may also see pop-ups on your screen that want you to pay for a service or reveal personal information. A sudden increase in the number of ads you see online could be a sign of adware.