sigma-rules/rules/macos/persistence_folder_action_scripts_runtime.toml

[metadata]
creation_date = "2020/12/07"
integration = ["endpoint"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/02/22"

[rule]
author = ["Elastic"]
description = """
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.
"""
from = "now-9m"
index = ["auditbeat-*", "logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "Persistence via Folder Action Script"
references = ["https://posts.specterops.io/folder-actions-for-persistence-on-macos-8923f222343d"]
risk_score = 47
rule_id = "c292fa52-4115-408a-b897-e14f684b3cb7"
severity = "medium"
tags = ["Elastic", "Host", "macOS", "Threat Detection", "Execution", "Persistence"]
type = "eql"

query = '''
sequence by host.id with maxspan=5s
 [process where host.os.type == "macos" and event.type in ("start", "process_started", "info") and process.name == "com.apple.foundation.UserScriptService"] by process.pid
 [process where host.os.type == "macos" and event.type in ("start", "process_started") and process.name in ("osascript", "python", "tcl", "node", "perl", "ruby", "php", "bash", "csh", "zsh", "sh") and
  not process.args : "/Users/*/Library/Application Support/iTerm2/Scripts/AutoLaunch/*.scpt"
 ] by process.parent.pid
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1037"
name = "Boot or Logon Initialization Scripts"
reference = "https://attack.mitre.org/techniques/T1037/"


[rule.threat.tactic]
id = "TA0003"
name = "Persistence"
reference = "https://attack.mitre.org/tactics/TA0003/"
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1059"
name = "Command and Scripting Interpreter"
reference = "https://attack.mitre.org/techniques/T1059/"


[rule.threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"