Azure AD New MFA Method Registered For User
Description
The following analytic identifies the registration of a new Multi Factor authentication method for an Azure AD account. Adversaries who have obtained unauthorized access to an Azure AD account may register a new MFA method to maintain persistence.
- Type: TTP
-
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2023-01-30
- Author: Mauricio Velazco, Splunk
- ID: 2628b087-4189-403f-9044-87403f777a1b
Annotations
ATT&CK
Kill Chain Phase
- Exploitation
- Installation
NIST
- DE.CM
CIS20
- CIS 10
CVE
Search
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`azuread` category=AuditLogs operationName="User registered security info" properties.operationType=Add
| rename properties.* as *
| rename targetResources{}.* as *
| stats values(userPrincipalName) as userPrincipalName by _time, resultDescription, result, callerIpAddress
| `azure_ad_new_mfa_method_registered_for_user_filter`
Macros
The SPL above uses the following Macros:
azure_ad_new_mfa_method_registered_for_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
- category
- operationName
- properties.operationType
- userPrincipalName
- resultDescription
- result
- callerIpAddress
How To Implement
You must install the latest version of Splunk Add-on for Microsoft Cloud Services from Splunkbase (https://splunkbase.splunk.com/app/3110/#/details). You must be ingesting Azure Active Directory events into your Splunk environment through an EventHub. Specifically, this analytic leverages the AuditLogs log category.
Known False Positives
Newly onboarded users who are registering an MFA method for the first time will also trigger this detection.
Associated Analytic Story
RBA
Risk Score | Impact | Confidence | Message |
---|---|---|---|
64.0 | 80 | 80 | UPDATE message |
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://docs.microsoft.com/en-us/azure/active-directory/authentication/concept-mfa-howitworks
- https://attack.mitre.org/techniques/T1556/
- https://attack.mitre.org/techniques/T1556/006/
- https://twitter.com/jhencinski/status/1618660062352007174
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: 1