Explicit MFA Deny

let aadFunc = (tableName:string){
table(tableName)
| where ResultType == 500121
| where Status has "MFA Denied; user declined the authentication" or Status has "MFA denied; Phone App Reported Fraud"
| extend Type = Type
| extend timestamp = TimeGenerated, Name = tostring(split(UserPrincipalName,'@',0)[0]), UPNSuffix = tostring(split(UserPrincipalName,'@',1)[0])
};
let aadSignin = aadFunc("SigninLogs");
let aadNonInt = aadFunc("AADNonInteractiveUserSignInLogs");
union isfuzzy=true aadSignin, aadNonInt

queryFrequency: 1d
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: Name
    identifier: Name
  - columnName: UPNSuffix
    identifier: UPNSuffix
- entityType: IP
  fieldMappings:
  - columnName: IPAddress
    identifier: Address
- entityType: URL
  fieldMappings:
  - columnName: ClientAppUsed
    identifier: Url
severity: Medium
triggerThreshold: 0
relevantTechniques:
- T1110
query: |
  let aadFunc = (tableName:string){
  table(tableName)
  | where ResultType == 500121
  | where Status has "MFA Denied; user declined the authentication" or Status has "MFA denied; Phone App Reported Fraud"
  | extend Type = Type
  | extend timestamp = TimeGenerated, Name = tostring(split(UserPrincipalName,'@',0)[0]), UPNSuffix = tostring(split(UserPrincipalName,'@',1)[0])
  };
  let aadSignin = aadFunc("SigninLogs");
  let aadNonInt = aadFunc("AADNonInteractiveUserSignInLogs");
  union isfuzzy=true aadSignin, aadNonInt  
id: a22740ec-fc1e-4c91-8de6-c29c6450ad00
triggerOperator: gt
version: 1.0.2
requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - SigninLogs
- connectorId: AzureActiveDirectory
  dataTypes:
  - AADNonInteractiveUserSignInLogs
description: |
    'User explicitly denies MFA push, indicating that login was not expected and the account's password may be compromised.'
queryPeriod: 1d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/ExplicitMFADeny.yaml
status: Available
name: Explicit MFA Deny
tactics:
- CredentialAccess
kind: Scheduled

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/a22740ec-fc1e-4c91-8de6-c29c6450ad00')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a22740ec-fc1e-4c91-8de6-c29c6450ad00')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Explicit MFA Deny",
        "description": "'User explicitly denies MFA push, indicating that login was not expected and the account's password may be compromised.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let aadFunc = (tableName:string){\ntable(tableName)\n| where ResultType == 500121\n| where Status has \"MFA Denied; user declined the authentication\" or Status has \"MFA denied; Phone App Reported Fraud\"\n| extend Type = Type\n| extend timestamp = TimeGenerated, Name = tostring(split(UserPrincipalName,'@',0)[0]), UPNSuffix = tostring(split(UserPrincipalName,'@',1)[0])\n};\nlet aadSignin = aadFunc(\"SigninLogs\");\nlet aadNonInt = aadFunc(\"AADNonInteractiveUserSignInLogs\");\nunion isfuzzy=true aadSignin, aadNonInt\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess"
        ],
        "techniques": [
          "T1110"
        ],
        "alertRuleTemplateName": "a22740ec-fc1e-4c91-8de6-c29c6450ad00",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "Name",
                "columnName": "Name"
              },
              {
                "identifier": "UPNSuffix",
                "columnName": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPAddress"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "identifier": "Url",
                "columnName": "ClientAppUsed"
              }
            ]
          }
        ],
        "status": "Available",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/ExplicitMFADeny.yaml",
        "templateVersion": "1.0.2"
      }
    }
  ]
}