Multi-Factor Authentication Disabled for a User

(union isfuzzy=true
(AuditLogs
| where OperationName =~ "Disable Strong Authentication"
| extend _parsedIntiatedByUser = parse_json(tostring(InitiatedBy.user))
| extend _parsedIntiatedByApp = parse_json(tostring(InitiatedBy.app))
| extend IPAddress = tostring(_parsedIntiatedByUser.ipAddress)
| extend InitiatedByUser = iff(isnotempty(tostring(_parsedIntiatedByUser.userPrincipalName)),
 tostring(_parsedIntiatedByUser.userPrincipalName), tostring(_parsedIntiatedByApp.displayName))
| extend Targetprop = todynamic(TargetResources)
| extend TargetUser = tostring(Targetprop[0].userPrincipalName)
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by User = TargetUser, InitiatedByUser , Operation = OperationName , CorrelationId, IPAddress, Category, Source = SourceSystem , AADTenantId, Type
),
(AWSCloudTrail
| where EventName in~ ("DeactivateMFADevice", "DeleteVirtualMFADevice")
| extend _parsedRequestParameters = parse_json(RequestParameters)
| extend InstanceProfileName = tostring(_parsedRequestParameters.InstanceProfileName)
| extend TargetUser = tostring(_parsedRequestParameters.userName)
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by User = TargetUser, Source = EventSource , Operation = EventName , TenantorInstance_Detail = InstanceProfileName, IPAddress = SourceIpAddress
)
)
| extend timestamp = StartTimeUtc, UserName = tostring(split(User, '@', 0)[0]), UPNSuffix = tostring(split(User, '@', 1)[0])

relevantTechniques:
- T1098
- T1556
name: Multi-Factor Authentication Disabled for a User
requiredDataConnectors:
- dataTypes:
  - AuditLogs
  connectorId: AzureActiveDirectory
- dataTypes:
  - AWSCloudTrail
  connectorId: AWS
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: UserName
  - identifier: UPNSuffix
    columnName: UPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: IPAddress
  entityType: IP
triggerThreshold: 0
id: 65c78944-930b-4cae-bd79-c3664ae30ba7
tactics:
- CredentialAccess
- Persistence
version: 1.0.5
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cloud Identity Threat Protection Essentials/Analytic Rules/MFADisable.yaml
queryPeriod: 1h
kind: Scheduled
queryFrequency: 1h
severity: Medium
status: Available
description: |
    'Multi-Factor Authentication (MFA) helps prevent credential compromise. This alert identifies when an attempt has been made to deactivate MFA for a user.'
query: |
  (union isfuzzy=true
  (AuditLogs
  | where OperationName =~ "Disable Strong Authentication"
  | extend _parsedIntiatedByUser = parse_json(tostring(InitiatedBy.user))
  | extend _parsedIntiatedByApp = parse_json(tostring(InitiatedBy.app))
  | extend IPAddress = tostring(_parsedIntiatedByUser.ipAddress)
  | extend InitiatedByUser = iff(isnotempty(tostring(_parsedIntiatedByUser.userPrincipalName)),
   tostring(_parsedIntiatedByUser.userPrincipalName), tostring(_parsedIntiatedByApp.displayName))
  | extend Targetprop = todynamic(TargetResources)
  | extend TargetUser = tostring(Targetprop[0].userPrincipalName)
  | summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by User = TargetUser, InitiatedByUser , Operation = OperationName , CorrelationId, IPAddress, Category, Source = SourceSystem , AADTenantId, Type
  ),
  (AWSCloudTrail
  | where EventName in~ ("DeactivateMFADevice", "DeleteVirtualMFADevice")
  | extend _parsedRequestParameters = parse_json(RequestParameters)
  | extend InstanceProfileName = tostring(_parsedRequestParameters.InstanceProfileName)
  | extend TargetUser = tostring(_parsedRequestParameters.userName)
  | summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by User = TargetUser, Source = EventSource , Operation = EventName , TenantorInstance_Detail = InstanceProfileName, IPAddress = SourceIpAddress
  )
  )
  | extend timestamp = StartTimeUtc, UserName = tostring(split(User, '@', 0)[0]), UPNSuffix = tostring(split(User, '@', 1)[0])  
triggerOperator: gt

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/65c78944-930b-4cae-bd79-c3664ae30ba7')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/65c78944-930b-4cae-bd79-c3664ae30ba7')]",
      "properties": {
        "alertRuleTemplateName": "65c78944-930b-4cae-bd79-c3664ae30ba7",
        "customDetails": null,
        "description": "'Multi-Factor Authentication (MFA) helps prevent credential compromise. This alert identifies when an attempt has been made to deactivate MFA for a user.'\n",
        "displayName": "Multi-Factor Authentication Disabled for a User",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "UserName",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cloud Identity Threat Protection Essentials/Analytic Rules/MFADisable.yaml",
        "query": "(union isfuzzy=true\n(AuditLogs\n| where OperationName =~ \"Disable Strong Authentication\"\n| extend _parsedIntiatedByUser = parse_json(tostring(InitiatedBy.user))\n| extend _parsedIntiatedByApp = parse_json(tostring(InitiatedBy.app))\n| extend IPAddress = tostring(_parsedIntiatedByUser.ipAddress)\n| extend InitiatedByUser = iff(isnotempty(tostring(_parsedIntiatedByUser.userPrincipalName)),\n tostring(_parsedIntiatedByUser.userPrincipalName), tostring(_parsedIntiatedByApp.displayName))\n| extend Targetprop = todynamic(TargetResources)\n| extend TargetUser = tostring(Targetprop[0].userPrincipalName)\n| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by User = TargetUser, InitiatedByUser , Operation = OperationName , CorrelationId, IPAddress, Category, Source = SourceSystem , AADTenantId, Type\n),\n(AWSCloudTrail\n| where EventName in~ (\"DeactivateMFADevice\", \"DeleteVirtualMFADevice\")\n| extend _parsedRequestParameters = parse_json(RequestParameters)\n| extend InstanceProfileName = tostring(_parsedRequestParameters.InstanceProfileName)\n| extend TargetUser = tostring(_parsedRequestParameters.userName)\n| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by User = TargetUser, Source = EventSource , Operation = EventName , TenantorInstance_Detail = InstanceProfileName, IPAddress = SourceIpAddress\n)\n)\n| extend timestamp = StartTimeUtc, UserName = tostring(split(User, '@', 0)[0]), UPNSuffix = tostring(split(User, '@', 1)[0])\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess",
          "Persistence"
        ],
        "techniques": [
          "T1098",
          "T1556"
        ],
        "templateVersion": "1.0.5",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}