Rc.common
During the boot process, macOS executes source /etc/rc.common, which is a shell script containing various utility functions. This file also defines routines for processing command-line arguments and for gathering system settings, and is thus recommended to include in the start of Startup Item Scripts (Citation: Startup Items). In macOS and OS X, this is now a deprecated technique in favor of launch agents and launch daemons, but is currently still used.
Adversaries can use the rc.common file as a way to hide code for persistence that will execute on each reboot as the root user (Citation: Methods of Mac Malware Persistence).
Mitigations |
|
| Mitigation | Description |
|---|---|
| User Account Management |
Manage the creation, modification, use, and permissions associated to user accounts. |
| Rc.common Mitigation |
Limit privileges of user accounts so only authorized users can edit the rc.common file. |
Detection
The /etc/rc.common file can be monitored to detect changes from the company policy. Monitor process execution resulting from the rc.common script for unusual or unknown applications or behavior.
Связанные риски
Каталоги
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