Red Sift - MFA disabled on account

Status: available
Severity: high
Time window: 1h
Source: github.com/Azure/Azure-Sentinel

This query searches for authentication events where MFA has been disabled on an account, which may indicate account takeover activity, weakened account protections, or unauthorized administrative changes.

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1556` Modify Authentication Process
Defense Impairment	`T1556` Modify Authentication Process
Credential Access	`T1556` Modify Authentication Process

Rule body

id: 16f26d2c-6296-490b-af4f-b30bcf1c4461
name: Red Sift - MFA disabled on account
description: |
  This query searches for authentication events where MFA has been disabled on an account, which may indicate account takeover activity, weakened account protections, or unauthorized administrative changes.
severity: High
status: Available
requiredDataConnectors:
  - connectorId: RedSiftPush
    dataTypes:
      - RedSiftAuth_CL
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
  - DefenseEvasion
relevantTechniques:
  - T1556
query: |
  RedSiftAuth_CL
  | extend
      ActivityName = tostring(column_ifexists("ActivityName", "")),
      UserEmail = tostring(column_ifexists("UserEmail", "")),
      ActorUserEmail = tostring(column_ifexists("ActorUserEmail", "")),
      SrcIp = tostring(column_ifexists("SrcIp", "")),
      HttpUserAgent = tostring(column_ifexists("HttpUserAgent", "")),
      ServiceName = tostring(column_ifexists("ServiceName", "")),
      Severity = tostring(column_ifexists("Severity", "")),
      UserUid = tostring(column_ifexists("UserUid", "")),
      ActorUserUid = tostring(column_ifexists("ActorUserUid", ""))
  | where ActivityName =~ "MFA Disabled"
  | where isnotempty(UserEmail) or isnotempty(ActorUserEmail)
  | extend TargetAccount = iff(isnotempty(UserEmail), UserEmail, ActorUserEmail)
  | project
      TimeGenerated,
      TargetAccount,
      UserEmail,
      ActorUserEmail,
      SrcIp,
      HttpUserAgent,
      ServiceName,
      ActivityName,
      Severity,
      UserUid,
      ActorUserUid
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: TargetAccount
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: SrcIp
customDetails:
  ActorUserEmail: ActorUserEmail
  UserAgent: HttpUserAgent
  ServiceName: ServiceName
  ActivityName: ActivityName
alertDetailsOverride:
  alertDisplayNameFormat: "RedSift - MFA Disabled for {{TargetAccount}}"
  alertDescriptionFormat: "MFA was disabled for {{TargetAccount}}. Actor: {{ActorUserEmail}}. Source IP: {{SrcIp}}."
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: true
    reopenClosedIncident: false
    lookbackDuration: P1D
    matchingMethod: Selected
    groupByEntities:
      - Account
eventGroupingSettings:
  aggregationKind: AlertPerResult
suppressionEnabled: false
suppressionDuration: PT1H
version: 1.0.0
kind: Scheduled

Stages and Predicates

Stage 1: `source`

RedSiftAuth_CL

Stage 2: `extend`

| extend
    ActivityName = tostring(column_ifexists("ActivityName", "")),
    UserEmail = tostring(column_ifexists("UserEmail", "")),
    ActorUserEmail = tostring(column_ifexists("ActorUserEmail", "")),
    SrcIp = tostring(column_ifexists("SrcIp", "")),
    HttpUserAgent = tostring(column_ifexists("HttpUserAgent", "")),
    ServiceName = tostring(column_ifexists("ServiceName", "")),
    Severity = tostring(column_ifexists("Severity", "")),
    UserUid = tostring(column_ifexists("UserUid", "")),
    ActorUserUid = tostring(column_ifexists("ActorUserUid", ""))

Stage 3: `where`

| where ActivityName =~ "MFA Disabled"

Stage 4: `where`

| where isnotempty(UserEmail) or isnotempty(ActorUserEmail)

Stage 5: `extend`

| extend TargetAccount = iff(isnotempty(UserEmail), UserEmail, ActorUserEmail)

TargetAccount =

ifisnotempty(UserEmail)UserEmail

elseActorUserEmail

Stage 6: `project`

| project
    TimeGenerated,
    TargetAccount,
    UserEmail,
    ActorUserEmail,
    SrcIp,
    HttpUserAgent,
    ServiceName,
    ActivityName,
    Severity,
    UserUid,
    ActorUserUid

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`ActivityName`	eq	`MFA Disabled`	`field:"ActivityName" kind:eq value:"MFA Disabled"`
`ActorUserEmail`	is_not_null	(no value, null check)	`field:"ActorUserEmail" kind:is_not_null`
`UserEmail`	is_not_null	(no value, null check)	`field:"UserEmail" kind:is_not_null`

Output fields

These fields are emitted when the rule matches.

Field	Source
`ActivityName`	`project`
`ActorUserEmail`	`project`
`ActorUserUid`	`project`
`HttpUserAgent`	`project`
`ServiceName`	`project`
`Severity`	`project`
`SrcIp`	`project`
`TargetAccount`	`project`
`TimeGenerated`	`project`
`UserEmail`	`project`
`UserUid`	`project`

Red Sift - MFA disabled on account

MITRE ATT&CK coverage

Rule body

Stages and Predicates

Stage 1: source

Stage 2: extend

Stage 3: where

Stage 4: where

Stage 5: extend

Stage 6: project