[metadata]
creation_date = "2023/02/13"
integration = ["endpoint"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/06/22"

[rule]
author = ["Elastic"]
description = """
Identifies attempts to add a user to a privileged group. Attackers may add users to a privileged group in order to 
establish persistence on a system.
"""
from = "now-9m"
index = ["logs-endpoint.events.*", "endgame-*"]
language = "eql"
license = "Elastic License v2"
name = "Linux User Added to Privileged Group"
risk_score = 47
rule_id = "43d6ec12-2b1c-47b5-8f35-e9de65551d3b"
severity = "medium"
tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Persistence", "Data Source: Elastic Endgame"]
timestamp_override = "event.ingested"
type = "eql"
query = '''
process where host.os.type == "linux" and event.type == "start" and
process.parent.name == "sudo" and
process.args in ("root", "admin", "wheel", "staff", "sudo",
                             "disk", "video", "shadow", "lxc", "lxd") and
(
  process.name in ("usermod", "adduser") or
  process.name == "gpasswd" and 
  process.args in ("-a", "--add", "-M", "--members") 
)
'''

[[rule.threat]]
framework = "MITRE ATT&CK"

[[rule.threat.technique]]
id = "T1136"
name = "Create Account"
reference = "https://attack.mitre.org/techniques/T1136/"

[[rule.threat.technique.subtechnique]]
id = "T1136.001"
name = "Local Account"
reference = "https://attack.mitre.org/techniques/T1136/001/"

[rule.threat.tactic]
id = "TA0003"
name = "Persistence"
reference = "https://attack.mitre.org/tactics/TA0003/"