O365 New Federated Domain Added

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Description

This search detects the addition of a new Federated domain.

• Type: TTP

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

• Last Updated: 2021-01-26
• Author: Rod Soto, Splunk
• ID: e155876a-6048-11eb-ae93-0242ac130002

Annotations

ATT&CK

ATT&CK

ID	Technique	Tactic
T1136.003	Cloud Account	Persistence

T1136

Create Account

Persistence

Kill Chain Phase

• Installation

NIST

• DE.CM

CIS20

• CIS 10

CVE

Search

`o365_management_activity` Workload=Exchange Operation="Add-FederatedDomain" 
| stats count min(_time) as firstTime max(_time) as lastTime values(Parameters{}.Value) as Parameters.Value by ObjectId Operation OrganizationName OriginatingServer UserId UserKey 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `o365_new_federated_domain_added_filter`

Macros

The SPL above uses the following Macros:

• o365_management_activity
• security_content_ctime

o365_new_federated_domain_added_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
• Parameters{}.Value
• ObjectId
• OrganizationName
• OriginatingServer
• UserId
• UserKey

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 Federated domain is not necessarily malicious, however these events need to be followed closely, as it may indicate federated credential abuse or backdoor via federated identities at a similar or different cloud provider.

Associated Analytic Story

• Office 365 Detections
• Cloud Federated Credential Abuse

RBA

Risk Score	Impact	Confidence	Message
64.0	80	80	User $UserId$ has added a new federated domaain $Parameters.Value$ for $OrganizationName$

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
• https://www.splunk.com/en_us/blog/security/a-golden-saml-journey-solarwinds-continued.html
• https://blog.sygnia.co/detection-and-hunting-of-golden-saml-attack?hsLang=en
• https://o365blog.com/post/aadbackdoor/

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

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