O365 Add App Role Assignment Grant User

Try in Splunk Security Cloud

Description

This search detects the creation of a new Federation setting by alerting about an specific event related to its creation.

• Type: TTP

• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

• Last Updated: 2021-01-26
• Author: Rod Soto, Splunk
• ID: b2c81cc6-6040-11eb-ae93-0242ac130002

Annotations

ATT&CK

ATT&CK

ID	Technique	Tactic
T1136.003	Cloud Account	Persistence

T1136

Create Account

Persistence

Kill Chain Phase

• Exploitation

NIST

CIS20

CVE

Search

`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 ActorIpAddress 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_management_activity
• security_content_ctime

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
• ActorIpAddress
• 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

• Office 365 Detections
• Cloud Federated Credential Abuse

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

• https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1136.003/o365_new_federation/o365_new_federation.json

source | version: 1