More simply, YaraScan is one part of the 'volatility suite' here ĭo realise that a virus and illegally pirated material both are only detected by a 'signature' set of code paths and both often reliant on bugs, exploits and weak patching, so it's only to be expected that the strongest modern antivirus was grown from a copyright infringement detection tool. The reason for it's obscene memory usage is basically why OSX doesn't have a formal 'antivirus'. MRT/YaraScan is a MacOS prodvided antivirus-copyright tool. Most files inside the folder are timestamped and, supposedly when the app was released by Apple.Īnswer originally posted by user1901982 in Super User - What is “YaraScanService” that shows up in macOS Mojave Beta (10.14) and macOS High Sierra (10.13.6)?Ĭopied here for convenience, as community wiki. The MRT.app is timestamped on 1 along with a bunch of other folders (apparently the date when I accepted an Apple update).
I would assume that if you have dozens of gigabytes of zip, tar, bzip, rar, jar archives then yarascan will unpack them all to memory or disc in order to scan them, and there is absolutely no way to whitelist or exclude them.
Iantivirus for mac high sierra how to#
System/Library/CoreServices/MRT.app/Contents/XPCServices/YaraScanService.xpc/Contents/MacOS/YaraScanServiceĪccording to this thread and another one it appears to be some kind of Apple's built-in antivirus that is doing its scanning yet there doesn't seem to be a way to disable or remove it apart from killing it from the Activity Monitor or with pkill.Īny pointers on how to control it or stop/disable it? Recently on MacOS 10.13.6 I have noticed high CPU usage and identified the process YaraScanService as consuming close to 90% CPU.
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