O365 Disable MFA
This search detects when multi factor authentication has been disabled, what entitiy performed the action and against what user
- Type: TTP
- Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Datamodel: Authentication
- Last Updated: 2022-02-03
- Author: Rod Soto, Splunk
- ID: c783dd98-c703-4252-9e8a-f19d9f5c949e
Kill Chain Phase
- CIS 10
1 2 3 4 5 6 `o365_management_activity` Operation="Disable Strong Authentication." | stats count earliest(_time) as firstTime latest(_time) as lastTime by UserType Operation UserId ResultStatus object | rename UserType AS user_type, Operation AS action, UserId AS src_user, object AS user, ResultStatus AS result | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `o365_disable_mfa_filter`
The SPL above uses the following Macros:
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.
List of fields required to use this analytic.
How To Implement
You must install the 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
|64.0||80||80||User $user$ has executed an operation $Operation$ for this destination $dest$|
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
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source | version: 1