Emond Rules Creation or Modification

 1[metadata]
 2creation_date = "2021/01/11"
 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 the creation or modification of the Event Monitor Daemon (emond) rules. Adversaries may abuse this service by
13writing a rule to execute commands when a defined event occurs, such as system start up or user authentication.
14"""
15from = "now-9m"
16index = ["auditbeat-*", "logs-endpoint.events.*"]
17language = "eql"
18license = "Elastic License v2"
19name = "Emond Rules Creation or Modification"
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.xorrior.com/emond-persistence/",
26    "https://www.sentinelone.com/blog/how-malware-persists-on-macos/",
27]
28risk_score = 47
29rule_id = "a6bf4dd4-743e-4da8-8c03-3ebd753a6c90"
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 = '''
36file where host.os.type == "macos" and event.type != "deletion" and
37 file.path : ("/private/etc/emond.d/rules/*.plist", "/etc/emon.d/rules/*.plist", "/private/var/db/emondClients/*")
38'''
39
40
41[[rule.threat]]
42framework = "MITRE ATT&CK"
43[[rule.threat.technique]]
44id = "T1546"
45name = "Event Triggered Execution"
46reference = "https://attack.mitre.org/techniques/T1546/"
47[[rule.threat.technique.subtechnique]]
48id = "T1546.014"
49name = "Emond"
50reference = "https://attack.mitre.org/techniques/T1546/014/"
51
52
53
54[rule.threat.tactic]
55id = "TA0003"
56name = "Persistence"
57reference = "https://attack.mitre.org/tactics/TA0003/"