Try it using Invoke-Atomic

Plist File Modification

Description from ATT&CK

Adversaries may modify property list files (plist files) to enable other malicious activity, while also potentially evading and bypassing system defenses. macOS applications use plist files, such as the info.plist file, to store properties and configuration settings that inform the operating system how to handle the application at runtime. Plist files are structured metadata in key-value pairs formatted in XML based on Apple's Core Foundation DTD. Plist files can be saved in text or binary format.(Citation: fileinfo plist file description)

Adversaries can modify key-value pairs in plist files to influence system behaviors, such as hiding the execution of an application (i.e. Hidden Window) or running additional commands for persistence (ex: Launch Agent/Launch Daemon or Re-opened Applications).

For example, adversaries can add a malicious application path to the 

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~/Library/Preferences/com.apple.dock.plist
file, which controls apps that appear in the Dock. Adversaries can also modify the LSUIElement key in an application’s info.plist file to run the app in the background. Adversaries can also insert key-value pairs to insert environment variables, such as LSEnvironment, to enable persistence via Dynamic Linker Hijacking.(Citation: wardle chp2 persistence)(Citation: eset_osx_flashback)

Atomic Tests

Atomic Test #1 - Plist Modification

Modify MacOS plist file in one of two directories

Supported Platforms: macos

auto_generated_guid: 394a538e-09bb-4a4a-95d1-b93cf12682a8

Inputs:

None

Run it with these steps!

  1. Modify a .plist in

    /Library/Preferences

    OR

    ~/Library/Preferences

  2. Subsequently, follow the steps for adding and running via Launch Agent

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