Brent Murphy
21431101b7
* Create initial_access_external_guest_user_invite.toml * Update rules/azure/initial_access_external_guest_user_invite.toml Co-authored-by: David French <56409778+threat-punter@users.noreply.github.com> * update mitre metadata * lint Co-authored-by: David French <56409778+threat-punter@users.noreply.github.com>
67 lines
2.2 KiB
TOML
67 lines
2.2 KiB
TOML
[metadata]
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creation_date = "2020/08/31"
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ecs_version = ["1.6.0"]
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maturity = "production"
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updated_date = "2020/08/31"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies an invitation to an external user in Azure Active Directory (AD). Azure AD is extended to include
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collaboration, allowing you to invite people from outside your organization to be guest users in your cloud account.
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Unless there is a business need to provision guest access, it is best practice avoid creating guest users. Guest users
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could potentially be overlooked indefinitely leading to a potential vulnerability.
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"""
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false_positives = [
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"""
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Guest user invitations may be sent out by a system or network administrator. Verify whether the username, hostname,
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and/or resource name should be making changes in your environment. Guest user invitations from unfamiliar users or
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hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
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""",
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]
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from = "now-25m"
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index = ["filebeat-*"]
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language = "kuery"
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license = "Elastic License"
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name = "Azure External Guest User Invitation"
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note = "The Azure Filebeat module must be enabled to use this rule."
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references = ["https://docs.microsoft.com/en-us/azure/governance/policy/samples/cis-azure-1-1-0"]
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risk_score = 21
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rule_id = "141e9b3a-ff37-4756-989d-05d7cbf35b0e"
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severity = "low"
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tags = ["Elastic", "Azure", "SecOps", "Continuous Monitoring", "Identity and Access"]
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type = "query"
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query = '''
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event.module:azure and event.dataset:azure.auditlogs and event.category:AuditLogs and azure.auditlogs.operation_name:"Invite external user" and azure.auditlogs.properties.target_resources.*.display_name:guest and event.outcome:Success
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'''
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1078"
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name = "Valid Accounts"
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reference = "https://attack.mitre.org/techniques/T1078/"
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[rule.threat.tactic]
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id = "TA0001"
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name = "Initial Access"
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reference = "https://attack.mitre.org/tactics/TA0001/"
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1078"
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name = "Valid Accounts"
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reference = "https://attack.mitre.org/techniques/T1078/"
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[rule.threat.tactic]
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id = "TA0003"
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name = "Persistence"
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reference = "https://attack.mitre.org/tactics/TA0003/"
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