O365 Add App Role Assignment Grant User
Description
This search is designed to detect the creation of a new Federation setting by alerting on a specific event associated with its creation. By monitoring for this event, the search can identify any instances where a Federation setting is being created within the system. This can help in detecting and monitoring any unauthorized or suspicious changes to the Federation settings, providing an additional layer of security for your environment.
- Type: TTP
-
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2023-07-11
- Author: Rod Soto, Splunk
- ID: b2c81cc6-6040-11eb-ae93-0242ac130002
Annotations
ATT&CK
Kill Chain Phase
- Installation
NIST
- DE.CM
CIS20
- CIS 10
CVE
Search
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`o365_management_activity` Workload=AzureActiveDirectory Operation="Add app role assignment grant to user."
| stats count min(_time) as firstTime max(_time) as lastTime values(Actor{}.ID) as Actor.ID values(Actor{}.Type) as Actor.Type by UserId dest ResultStatus
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `o365_add_app_role_assignment_grant_user_filter`
Macros
The SPL above uses the following Macros:
o365_add_app_role_assignment_grant_user_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
- Workload
- Operation
- Actor{}.ID
- Actor{}.Type
- UserId
- dest
- ResultStatus
How To Implement
You must install splunk Microsoft Office 365 add-on. This search works with o365:management:activity
Known False Positives
The creation of a new Federation is not necessarily malicious, however this events need to be followed closely, as it may indicate federated credential abuse or backdoor via federated identities at a different cloud provider.
Associated Analytic Story
RBA
Risk Score | Impact | Confidence | Message |
---|---|---|---|
18.0 | 30 | 60 | User $Actor.ID$ has created a new federation setting on $dest$ from IP Address $ActorIpAddress$ |
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://www.fireeye.com/content/dam/fireeye-www/blog/pdfs/wp-m-unc2452-2021-000343-01.pdf
- https://www.cisa.gov/uscert/ncas/alerts/aa21-008a
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