Overnight, Apple has pushed two updates, to the data files used by XProtect, bringing its version number to 2144 dated 15 April 2021, and to its malware removal tool MRT, bringing it to version 1.77, also dated 15 April 2021.

Apple doesn’t release any listing of the malware which the software it has built into El Capitan, Sierra, and High Sierra is expected to protect against. Here’s a breakdown of the malware which the latest versions (MRT 1.35 and XProtect 2099) should block or remove. Note that these are the malware which XProtect and MRT aim to deal with. App Store: Allows apps only from the Mac App Store. This is the most secure setting. This is the most secure setting. All the developers of apps in the Mac App Store are identified by Apple, and each app is reviewed before it’s accepted. MacOS checks the app before it opens the first time to be certain it hasn’t been modified since the. Whenever i have issues or notice changes i check 'about this mac' and also check the applications list to see whether there have been recent updates. Today, after encountering the slow open and uploads from the desktop to itunes to my browsers, along with the slow mouse responses, i saw that apple updated the MRT app. I don't know what that means. Visual Studio 2019 for Mac. Develop apps and games for iOS, Android and using.NET. Download Visual Studio for Mac. Create and deploy scalable, performant apps using.NET and C# on the Mac.

Apple doesn’t release information about what these updates add or change, and obfuscates the identities of most malware detected by XProtect using internal code names.

Changes found in the XProtect Yara definitions include the addition of new signatures for MACOS.ef3df25 (Bundlore Script), MACOS.11eaac1 (VindInstaller.B), MACOS.0e32a32 (Bundlore Script) and MACOS.6eaea4b (XCSSET variants, which Apple names DUBROBBER.E). There are also changed signatures for MACOS.2afe6bd (Adload), MACOS.4d60c89 (Notarized Shlayer: DLVPlayer), MACOS.1db9cfa (XCSSET variants, which Apple names DUBROBBER.E). There’s been a lot of cleaning up of whitespace from the previous definitions, and Apple has added comments identifying MACOS.2070d41 as DUBROBBER.A, MACOS.9e2bab9 as DUBROBBER.B, MACOS.889c9e6 as DUBROBBER.C, and MACOS.1db9cfa as DUBROBBER.D.

You can check whether this update has been installed by opening System Information via About This Mac, and selecting the Installations item under Software. Contact us and informational links mac rattery.

A full listing of security data file versions is given by SilentKnight, LockRattler and SystHist for El Capitan, Sierra, High Sierra, Mojave, Catalina and Big Sur, available from their product page. If your Mac has not yet installed this update, you can force an update using SilentKnight, LockRattler, or at the command line.

I have updated the reference pages here which are accessed directly from LockRattler 4.2 and later using its Check blog button.

I maintain lists of the current versions of security data files for Big Sur on this page, Catalina on this page, Mojave on this page, High Sierra on this page, Sierra on this page, and El Capitan on this page.

I am grateful to Phil Stokes at Sentinel Labs for decoding of the obfuscated malware names here.

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