Know what to do when the tool on your Mac uses high CPU usage.

What is

The Malware Removal Tool ( is an application that lives in the CoreServices folder located in /System/Library, rather than the Applications or Utilities folders where user level programs are typically located. Despite taking the form of an application bundle, MRT is not supposed to be launched by users. in Mac makes Mac performance slow

Activity Monitor Mac

Issues with Third-party Antivirus Apps

Apple will update from time to time, with the latest updates. The content includes signatures of new malware.

Its updates affects other antivirus updates so some third-party antivirus software, which also contains the signature, mistakenly recognize as malware. You will see the popup warning that is detected as malicious.

Most Antivirus solution is to add it to the Exception List. However, there is a possibility for some malware to tamper with Adding this software to the Exception List will affect user’s Mac security.

Avoid False Positives with Antivirus One

Most antivirus software adopts a Localized Virus Pattern library. Antivirus One uses Cloud Virus Pattern to avoid false positives and ensure security.

Download Antivirus One to remove these malware to avoid occupying a large amount of system memory.

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