The article you've shared discusses a method of persistence for macOS malware using the TALAppsToRelaunchAtLogin array in the com.apple.loginwindow.plist file. This technique allows malicious applications to persist across user logouts and logins by leveraging a feature intended for restoring recently used applications.
Key Points:
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Persistence Mechanism:
- The malware needs to be running in the background when the user logs out.
- Upon logging back in, macOS restores the application as part of its "reopen last apps" functionality.
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Implementation Details:
- A simple C program is used to create a malicious app that runs indefinitely (
while(1)). - The
Info.plistfile for the app includes settings likeLSBackgroundOnly = true, which prevents the application from appearing in the Dock. - An injector script (written in Python) modifies the
com.apple.loginwindow.plistfile to include the malicious app's path and bundle ID.
- A simple C program is used to create a malicious app that runs indefinitely (
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Technical Steps:
- The malicious app is moved to a shared directory (
/Users/Shared/meow.app). - The app is launched manually once to ensure it appears in the session state.
- The malicious app is moved to a shared directory (
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