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Will you help a Mac neophyte remove malware?

I bought a used Mac and it has malware.  It is called xxx history fixer.  I've not used a Mac before.  What do I do?

The first thing you must do with a previously owned Mac is to erase it. Follow these instructions, and if you have questions, please ask.

If you don't erase the Mac, whatever malware it has is only the tip of the iceberg.

To properly sell or transfer ownership of a Mac, even to someone in your family, you must follow these instructions.

Refer to What to do before selling or giving away your Mac

1. If you enabled FileVault, disable it in System Preferences > Security & Privacy.
2. "Deauthorize" your iTunes account. Same for Audible if you have one.
3. System Preferences > iCloud > de-select "Back to My Mac" and "Find my Mac".
4. Sign out of iCloud. Select "Delete from Mac" when it appears.

Next: Remove all your personal information by completely erasing the Mac's internal storage.

5. If your Mac shipped with a grey System Install DVD, start your Mac with that disc inserted in the optical drive while holding the c key to boot from it instead of its internal volume, which should be erased before selling it.
   • Apple stopped shipping Macs requiring those discs in August, 2011.
6. If your Mac did not ship with discs, boot OS X Internet Recovery:
   • using four fingers press and hold the following keys: Shift, ⌘ (command), option, and R.
   • With a fifth finger press the power button to turn on the Mac.
   • Keep the other four fingers where they are until you see the "spinning globe" icon.
   • This method forces the Mac to download its originally installed OS from Apple's servers, which will not require an Apple ID to install.
7. Remove any Open Firmware password if you created one: select Firmware Password Utility from the Utilities menu and remove it.
8. Select Disk Utility from the Utilities menu.
9. Remove any partitions you may have created.
10. Select the Mac's hard disk icon (not the volume beneath it), then select the "Erase" tab.
11. Select the "Security Options" button and erase the disk.
    • The more "securely" you erase the disk, the longer it will take.
    • The fastest method is sufficient since all but the most expensive techniques and equipment will be able to recover securely erased data.
12. When it finishes, quit Disk Utility.
13. Select Install Mac OS X from the Utilities menu.
    • An Apple ID will not be required. If a prompt for an Apple ID appears, return to Step 5.
    • Do not create any user accounts.
14. When it finishes, shut down the computer.
15. If you want to install the bundled apps that were included with your Mac, restart by using your Applications DVD if one was included, and install the bundled apps.
    • Apps bundled with newer Macs that shipped without discs cannot be transferred. Its new owner must purchase them from the Mac App Store using his or her own Apple ID.
    • Those apps (Pages, Numbers, Keynote, GarageBand, and iMovie) are now free.

If the Mac is being sold to someone outside the family consider the following additional information:

16. System Install DVDs that came with your Mac should remain with it forever, and must be included with the sale.
17. Consider including your AppleCare certificate if you bought it, printed documentation, even the box if you still have it.
    • AppleCare stays with the equipment and is transferable.
18. Execute a bill of sale showing the Mac's serial number.
19. Once no longer in your possession, remove the Mac from your devices in My Support Profile.

最后更新：2017-09-09 11:32:24

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