persistence_microsoft_365_exchange_management_role_assignment.toml

[metadata]
creation_date = "2020/11/20"
integration = ["o365"]
maturity = "production"
updated_date = "2024/05/21"

[rule]
author = ["Elastic"]
description = """
Identifies when a new role is assigned to a management group in Microsoft 365. An adversary may attempt to add a role in
order to maintain persistence in an environment.
"""
false_positives = [
    """
    A new role may be assigned to a management group by a system or network administrator. Verify that the configuration
    change was expected. Exceptions can be added to this rule to filter expected behavior.
    """,
]
from = "now-30m"
index = ["filebeat-*", "logs-o365*"]
language = "kuery"
license = "Elastic License v2"
name = "Microsoft 365 Exchange Management Group Role Assignment"
note = """## Setup

The Office 365 Logs Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule."""
references = [
    "https://docs.microsoft.com/en-us/powershell/module/exchange/new-managementroleassignment?view=exchange-ps",
    "https://docs.microsoft.com/en-us/microsoft-365/admin/add-users/about-admin-roles?view=o365-worldwide",
]
risk_score = 47
rule_id = "98995807-5b09-4e37-8a54-5cae5dc932d7"
severity = "medium"
tags = [
    "Domain: Cloud",
    "Data Source: Microsoft 365",
    "Use Case: Identity and Access Audit",
    "Tactic: Persistence",
]
timestamp_override = "event.ingested"
type = "query"

query = '''
event.dataset:o365.audit and event.provider:Exchange and event.category:web and event.action:"New-ManagementRoleAssignment" and event.outcome:success
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1098"
name = "Account Manipulation"
reference = "https://attack.mitre.org/techniques/T1098/"


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