Persistence via Login or Logout Hook

 1[metadata]
 2creation_date = "2020/12/07"
 3integration = ["endpoint"]
 4maturity = "production"
 5min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 6min_stack_version = "8.3.0"
 7updated_date = "2023/06/22"
 8
 9[rule]
10author = ["Elastic"]
11description = """
12Identifies use of the Defaults command to install a login or logoff hook in MacOS. An adversary may abuse this
13capability to establish persistence in an environment by inserting code to be executed at login or logout.
14"""
15from = "now-9m"
16index = ["auditbeat-*", "logs-endpoint.events.*"]
17language = "eql"
18license = "Elastic License v2"
19name = "Persistence via Login or Logout Hook"
20note = """## Setup
21
22If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.
23"""
24references = [
25    "https://www.virusbulletin.com/uploads/pdf/conference_slides/2014/Wardle-VB2014.pdf",
26    "https://www.manpagez.com/man/1/defaults/",
27]
28risk_score = 47
29rule_id = "5d0265bf-dea9-41a9-92ad-48a8dcd05080"
30severity = "medium"
31tags = ["Domain: Endpoint", "OS: macOS", "Use Case: Threat Detection", "Tactic: Persistence", "Data Source: Elastic Defend"]
32timestamp_override = "event.ingested"
33type = "eql"
34
35query = '''
36process where host.os.type == "macos" and event.type == "start" and
37 process.name == "defaults" and process.args == "write" and process.args : ("LoginHook", "LogoutHook") and
38 not process.args :
39       (
40         "Support/JAMF/ManagementFrameworkScripts/logouthook.sh",
41         "Support/JAMF/ManagementFrameworkScripts/loginhook.sh",
42         "/Library/Application Support/JAMF/ManagementFrameworkScripts/logouthook.sh",
43         "/Library/Application Support/JAMF/ManagementFrameworkScripts/loginhook.sh"
44       )
45'''
46
47
48[[rule.threat]]
49framework = "MITRE ATT&CK"
50[[rule.threat.technique]]
51id = "T1037"
52name = "Boot or Logon Initialization Scripts"
53reference = "https://attack.mitre.org/techniques/T1037/"
54
55
56[rule.threat.tactic]
57id = "TA0003"
58name = "Persistence"
59reference = "https://attack.mitre.org/tactics/TA0003/"