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OS X Mountain Lion: Avoid harmful software

Avoid harmful software

Some software is harmful and can cause problems for your computer. Frequently, a harmful app will try to appear as an innocent document, such as a movie or graphic file. These apps, called “trojans,” are most often spread by Internet downloads and email enclosures.

Important: If you receive an application warning and you don’t expect the file to be an app, don’t open the file. Delete it from your computer.

Here are some tips to protect your computer from harmful apps.

  • Never download unlicensed or “pirated” software from the Internet.
  • Only use apps from a known and trusted source. You can limit the types of apps that open on your Mac, using the Security & Privacy preferences. For more information, see this help topic:

    Protect your Mac from malware

  • Run an antivirus program if you find any suspicious files or apps, or you notice any suspicious behavior on your computer.
  • To reduce the amount of exposure to harmful apps or files, limit the number of administrator users you create. Consider creating a standard user for your daily work and use the administrator user only when you need to install software or administer users.
  • If you enabled the root user and you don’t currently need it, disable it.
Last Modified: Aug 8, 2013
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  • Last Modified: Aug 8, 2013
  • Article: PH11098
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