Try in Splunk Security Cloud

Description

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

  • Last Updated: 2022-02-03
  • Author: Rod Soto, Splunk
  • ID: c783dd98-c703-4252-9e8a-f19d9f5c949e

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1556 Modify Authentication Process Credential Access, Defense Evasion, Persistence
Kill Chain Phase
  • Exploitation
NIST
CIS20
CVE
1
2
3
4
5
`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:

:information_source: 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 fields

List of fields required to use this analytic.

  • _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

RBA

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

:information_source: 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

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