O365 Tenant Wide Admin Consent Granted
Description
The following analytic identifies instances where admin consent is granted to an application within an Azure AD and Office 365 tenant. It leverages O365 audit logs, specifically events related to the admin consent action within the AzureActiveDirectory workload. This activity is significant because admin consent allows applications to access data across the entire tenant, potentially exposing vast amounts of organizational data. If confirmed malicious, an attacker could gain extensive and persistent access to organizational data, leading to data exfiltration, espionage, further malicious activities, and potential compliance violations.
- Type: TTP
-
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2024-05-29
- Author: Mauricio Velazco, Splunk
- ID: 50eaabf8-5180-4e86-bfb2-011472c359fc
Annotations
ATT&CK
Kill Chain Phase
- Installation
- Exploitation
NIST
- DE.CM
CIS20
- CIS 10
CVE
Search
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`o365_management_activity` Operation="Consent to application."
| eval new_field=mvindex('ModifiedProperties{}.NewValue', 4)
| rex field=new_field "ConsentType: (?<ConsentType>[^\,]+)"
| rex field=new_field "Scope: (?<Scope>[^\,]+)"
| search ConsentType = "AllPrincipals"
| stats count min(_time) as firstTime max(_time) as lastTime by Operation, user, object, ObjectId, ConsentType, Scope
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `o365_tenant_wide_admin_consent_granted_filter`
Macros
The SPL above uses the following Macros:
o365_tenant_wide_admin_consent_granted_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
Required fields
List of fields required to use this analytic.
- _time
- Operation
- user
- object
- ObjectId
- ModifiedProperties{}.NewValue
How To Implement
You must install the Splunk Microsoft Office 365 Add-on and ingest Office 365 management activity events.
Known False Positives
Legitimate applications may be granted tenant wide consent, filter as needed.
Associated Analytic Story
RBA
Risk Score | Impact | Confidence | Message |
---|---|---|---|
45.0 | 90 | 50 | The $object$ application registration was granted tenant wide admin consent. |
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
Reference
- https://attack.mitre.org/techniques/T1098/003/
- https://www.mandiant.com/resources/blog/remediation-and-hardening-strategies-for-microsoft-365-to-defend-against-unc2452
- https://learn.microsoft.com/en-us/security/operations/incident-response-playbook-app-consent
- https://learn.microsoft.com/en-us/azure/active-directory/manage-apps/grant-admin-consent?pivots=portal
- https://microsoft.github.io/Azure-Threat-Research-Matrix/Persistence/AZT501/AZT501-2/
Test Dataset
Replay any dataset to Splunk Enterprise by using our replay.py
tool or the UI.
Alternatively you can replay a dataset into a Splunk Attack Range
source | version: 2