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SSFileCopyReceiver Writing to Common Persistence Locations

Identifies the macOS Screen Sharing file copy helper SSFileCopyReceiver creating or modifying files in common persistence locations, including system-wide and per-user LaunchDaemons/LaunchAgents, shell profiles, SSH…

Description

Identifies the macOS Screen Sharing file copy helper SSFileCopyReceiver creating or modifying files in common persistence locations, including system-wide and per-user LaunchDaemons/LaunchAgents, shell profiles, SSH authorized_keys, cron tabs, and hidden paths under root's home directory. SSFileCopyReceiver performs file writes with root authority on behalf of a remote viewer.Pre-authentication exploitation of the Screen Sharing service (CVE-2026-65400) abuses this write primitive to establish persistence; observed in-the-wild activity dropped LaunchDaemons and modified shell startup files to run a cryptocurrency miner as root.

Detection logic

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Detection requirements

Platform
ContainersESXiIaaSIdentity ProviderLinuxmacOSNetwork DevicesOffice SuiteSaaSWindows

The rule states no platform. This is derived from the 3 ATT&CK techniques it maps to.

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