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https://github.com/splunk/security_content
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Eric
82 lines
3.6 KiB
YAML
82 lines
3.6 KiB
YAML
name: Azure AD Device Code Authentication
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id: d68d8732-6f7e-4ee5-a6eb-737f2b990b91
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version: 8
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date: '2025-05-02'
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author: Mauricio Velazco, Gowthamaraj Rajendran, Splunk
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status: production
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type: TTP
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data_source:
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- Azure Active Directory
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description: The following analytic identifies Azure Device Code Phishing attacks,
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which can lead to Azure Account Take-Over (ATO). It leverages Azure AD SignInLogs
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to detect suspicious authentication requests using the device code authentication
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protocol. This activity is significant as it indicates potential bypassing of Multi-Factor
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Authentication (MFA) and Conditional Access Policies (CAPs) through phishing emails.
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If confirmed malicious, attackers could gain unauthorized access to Azure AD, Exchange
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mailboxes, and Outlook Web Application (OWA), leading to potential data breaches
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and unauthorized data access.
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search: '`azure_monitor_aad` category=SignInLogs "properties.authenticationProtocol"=deviceCode
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| rename properties.* as *
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| rename userAgent as user_agent
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| fillnull
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| stats count min(_time) as firstTime max(_time) as lastTime by dest user src vendor_account vendor_product user_agent category
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `azure_ad_device_code_authentication_filter`'
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how_to_implement: You must install the latest version of Splunk Add-on for Microsoft
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Cloud Services from Splunkbase (https://splunkbase.splunk.com/app/3110/#/details).
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You must be ingesting Azure Active Directory events into your Splunk environment
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through an EventHub. This analytic was written to be used with the azure:monitor:aad
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sourcetype leveraging the SignInLogs log category.
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known_false_positives: In most organizations, device code authentication will be used
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to access common Microsoft service but it may be legitimate for others. Filter as
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needed.
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references:
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- https://attack.mitre.org/techniques/T1528
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- https://github.com/rvrsh3ll/TokenTactics
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- https://embracethered.com/blog/posts/2022/device-code-phishing/
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- https://0xboku.com/2021/07/12/ArtOfDeviceCodePhish.html
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- https://learn.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-device-code
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drilldown_searches:
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- name: View the detection results for - "$user$"
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search: '%original_detection_search% | search user = "$user$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$user$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$")
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starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
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values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
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as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
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as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: Device code requested for $user$ from $src$
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risk_objects:
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- field: user
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type: user
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score: 35
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threat_objects:
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- field: src
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type: ip_address
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tags:
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analytic_story:
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- Azure Active Directory Account Takeover
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asset_type: Azure Tenant
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mitre_attack_id:
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- T1528
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- T1566.002
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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security_domain: identity
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tests:
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- name: True Positive Test
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attack_data:
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- data:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1528/device_code_authentication/azure-audit.log
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source: Azure AD
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sourcetype: azure:monitor:aad
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