ID | Technique | Tactic |
---|---|---|
T1098 | Account Manipulation | Persistence |
T1098.003 | Additional Cloud Roles | Privilege Escalation |
Detection: 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.
Search
1`o365_management_activity` Operation="Consent to application."
2| eval new_field=mvindex('ModifiedProperties{}.NewValue', 4)
3| rex field=new_field "ConsentType: (?<ConsentType>[^\,]+)"
4| rex field=new_field "Scope: (?<Scope>[^\,]+)"
5| search ConsentType = "AllPrincipals"
6| stats count min(_time) as firstTime max(_time) as lastTime by Operation, user, object, ObjectId, ConsentType, Scope
7| `security_content_ctime(firstTime)`
8| `security_content_ctime(lastTime)`
9| `o365_tenant_wide_admin_consent_granted_filter`
Data Source
Name | Platform | Sourcetype | Source | Supported App |
---|---|---|---|---|
O365 Consent to application. | N/A | 'o365:management:activity' |
'o365' |
N/A |
Macros Used
Name | Value |
---|---|
o365_management_activity | sourcetype=o365:management:activity |
o365_tenant_wide_admin_consent_granted_filter | search * |
o365_tenant_wide_admin_consent_granted_filter
is an empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
Annotations
Default Configuration
This detection is configured by default in Splunk Enterprise Security to run with the following settings:
Setting | Value |
---|---|
Disabled | true |
Cron Schedule | 0 * * * * |
Earliest Time | -70m@m |
Latest Time | -10m@m |
Schedule Window | auto |
Creates Notable | Yes |
Rule Title | %name% |
Rule Description | %description% |
Notable Event Fields | user, dest |
Creates Risk Event | True |
Implementation
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
Risk Based Analytics (RBA)
Risk Message | Risk Score | Impact | Confidence |
---|---|---|---|
The $object$ application registration was granted tenant wide admin consent. | 45 | 90 | 50 |
References
-
https://learn.microsoft.com/en-us/security/operations/incident-response-playbook-app-consent
-
https://microsoft.github.io/Azure-Threat-Research-Matrix/Persistence/AZT501/AZT501-2/
Detection Testing
Test Type | Status | Dataset | Source | Sourcetype |
---|---|---|---|---|
Validation | ✅ Passing | N/A | N/A | N/A |
Unit | ✅ Passing | Dataset | o365 |
o365:management:activity |
Integration | ✅ Passing | Dataset | o365 |
o365:management:activity |
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: GitHub | Version: 2