---
title: "O365 Disable MFA"
excerpt: "Modify Authentication Process"
categories:
  - Cloud
last_modified_at: 2022-02-03
toc: true
toc_label: ""
tags:
  - Modify Authentication Process
  - Credential Access
  - Defense Evasion
  - Persistence
  - Splunk Security Analytics for AWS
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
---



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#### Description

This search detects when multi factor authentication has been disabled, what entitiy performed the action and against what user

- **Type**: [TTP](https://github.com/splunk/security_content/wiki/Detection-Analytic-Types)
- **Product**: Splunk Security Analytics for AWS, Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- **Datamodel**: 
- **Last Updated**: 2022-02-03
- **Author**: Rod Soto, Splunk
- **ID**: c783dd98-c703-4252-9e8a-f19d9f5c949e


#### [ATT&CK](https://attack.mitre.org/)

| ID             | Technique        |  Tactic             |
| -------------- | ---------------- |-------------------- |
| [T1556](https://attack.mitre.org/techniques/T1556/) | Modify Authentication Process | Credential Access, Defense Evasion, Persistence |

#### Search

```
`o365_management_activity` Operation="Disable Strong Authentication." 
| stats count earliest(_time) as firstTime latest(_time) as lastTime by UserType Operation UserId ResultStatus 
|`security_content_ctime(firstTime)` 
|`security_content_ctime(lastTime)` 
| `o365_disable_mfa_filter`
```

#### Macros
The SPL above uses the following Macros:
* [o365_management_activity](https://github.com/splunk/security_content/blob/develop/macros/o365_management_activity.yml)
* [security_content_ctime](https://github.com/splunk/security_content/blob/develop/macros/security_content_ctime.yml)

Note that `o365_disable_mfa_filter` is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

#### Required field
* _time
* Operation
* UserType
* user
* status
* signature
* dest
* ResultStatus


#### How To Implement
You must install splunk Microsoft Office 365 add-on. This search works with o365:management:activity

#### Known False Positives
Unless it is a special case, it is uncommon to disable MFA or Strong Authentication

#### Associated Analytic story
* [Office 365 Detections](/stories/office_365_detections)


#### Kill Chain Phase
* Actions on Objective



#### RBA

| Risk Score  | Impact      | Confidence   | Message      |
| ----------- | ----------- |--------------|--------------|
| 64.0 | 80 | 80 | User $user$ has executed an operation $Operation$ for this destination $dest$ |


Note that risk score is calculated base on the following formula: `(Impact * Confidence)/100`



#### Reference

* [https://attack.mitre.org/techniques/T1556/](https://attack.mitre.org/techniques/T1556/)



#### Test Dataset
Replay any dataset to Splunk Enterprise by using our [`replay.py`](https://github.com/splunk/attack_data#using-replaypy) tool or the [UI](https://github.com/splunk/attack_data#using-ui).
Alternatively you can replay a dataset into a [Splunk Attack Range](https://github.com/splunk/attack_range#replay-dumps-into-attack-range-splunk-server)

* [https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1556/o365_disable_mfa/o365_disable_mfa.json](https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1556/o365_disable_mfa/o365_disable_mfa.json)



[*source*](https://github.com/splunk/security_content/tree/develop/detections/cloud/o365_disable_mfa.yml) \| *version*: **1**