IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Persistence via Folder Action Script

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Persistence via Folder Action Script

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Detects modification of a Folder Action script. A Folder Action script is executed when the folder to which it is attached has items added or removed, or when its window is opened, closed, moved, or resized. Adversaries may abuse this feature to establish persistence by utilizing a malicious script.

Rule type: eql

Rule indices:

auditbeat-*
logs-endpoint.events.*

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://posts.specterops.io/folder-actions-for-persistence-on-macos-8923f222343d

Tags:

Elastic
Host
macOS
Threat Detection
Execution
Persistence

Version: 5 (version history)

Added (Elastic Stack release): 7.11.0

Last modified (Elastic Stack release): 8.2.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule query

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sequence by host.id with maxspan=5s [process where event.type in
("start", "process_started", "info") and process.name ==
"com.apple.foundation.UserScriptService"] by process.pid [process
where event.type in ("start", "process_started") and process.name in
("osascript", "python", "tcl", "node", "perl", "ruby", "php", "bash",
"csh", "zsh", "sh")] by process.parent.pid

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
Technique:
- Name: Boot or Logon Initialization Scripts
- ID: T1037
- Reference URL: https://attack.mitre.org/techniques/T1037/
Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
Technique:
- Name: Command and Scripting Interpreter
- ID: T1059
- Reference URL: https://attack.mitre.org/techniques/T1059/

Rule version history

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Version 5 (8.2.0 release)

Formatting only

Version 4 (8.0.0 release)

Updated query, changed from:

sequence by host.id with maxspan=5s [process where event.type in
("start", "process_started", "info") and process.name ==
"com.apple.foundation.UserScriptService"] by process.pid [process
where event.type in ("start", "process_started") and process.name in
("osascript", "sh")] by process.parent.pid

Version 3 (7.14.0 release)

Updated query, changed from:

sequence by host.id with maxspan=5s [process where event.type in
("start", "process_started", "info") and process.name ==
"com.apple.foundation.UserScriptService"] by process.pid [process
where event.type in ("start", "process_started") and process.name in
("osascript", "sh")] by process.ppid

Version 2 (7.12.0 release)

Formatting only

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