Attempts to sign in to disabled accounts

let threshold = 3;
let aadFunc = (tableName:string){
table(tableName)
| where ResultType == "50057"
| where ResultDescription =~ "User account is disabled. The account has been disabled by an administrator."
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), applicationCount = dcount(AppDisplayName),
applicationSet = make_set(AppDisplayName), count() by UserPrincipalName, IPAddress, Type
| where applicationCount >= threshold
| extend 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

version: 1.0.3
kind: Scheduled
status: Available
triggerThreshold: 0
name: Attempts to sign in to disabled accounts
triggerOperator: gt
tactics:
- InitialAccess
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/DisabledAccountSigninsAcrossManyApplications.yaml
relevantTechniques:
- T1078
query: |
  let threshold = 3;
  let aadFunc = (tableName:string){
  table(tableName)
  | where ResultType == "50057"
  | where ResultDescription =~ "User account is disabled. The account has been disabled by an administrator."
  | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), applicationCount = dcount(AppDisplayName),
  applicationSet = make_set(AppDisplayName), count() by UserPrincipalName, IPAddress, Type
  | where applicationCount >= threshold
  | extend 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: 75ea5c39-93e5-489b-b1e1-68fa6c9d2d04
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: UserPrincipalName
  - identifier: Name
    columnName: Name
  - identifier: UPNSuffix
    columnName: UPNSuffix
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPAddress
queryFrequency: 1d
queryPeriod: 1d
description: |
  'Identifies failed attempts to sign in to disabled accounts across multiple Azure Applications.
  Default threshold for Azure Applications attempted to sign in to is 3.
  References: https://docs.microsoft.com/azure/active-directory/reports-monitoring/reference-sign-ins-error-codes
  50057 - User account is disabled. The account has been disabled by an administrator.'  
severity: Medium
requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - SigninLogs
- connectorId: AzureActiveDirectory
  dataTypes:
  - AADNonInteractiveUserSignInLogs

{
  "$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/75ea5c39-93e5-489b-b1e1-68fa6c9d2d04')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/75ea5c39-93e5-489b-b1e1-68fa6c9d2d04')]",
      "properties": {
        "alertRuleTemplateName": "75ea5c39-93e5-489b-b1e1-68fa6c9d2d04",
        "customDetails": null,
        "description": "'Identifies failed attempts to sign in to disabled accounts across multiple Azure Applications.\nDefault threshold for Azure Applications attempted to sign in to is 3.\nReferences: https://docs.microsoft.com/azure/active-directory/reports-monitoring/reference-sign-ins-error-codes\n50057 - User account is disabled. The account has been disabled by an administrator.'\n",
        "displayName": "Attempts to sign in to disabled accounts",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "UserPrincipalName",
                "identifier": "FullName"
              },
              {
                "columnName": "Name",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/DisabledAccountSigninsAcrossManyApplications.yaml",
        "query": "let threshold = 3;\nlet aadFunc = (tableName:string){\ntable(tableName)\n| where ResultType == \"50057\"\n| where ResultDescription =~ \"User account is disabled. The account has been disabled by an administrator.\"\n| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), applicationCount = dcount(AppDisplayName),\napplicationSet = make_set(AppDisplayName), count() by UserPrincipalName, IPAddress, Type\n| where applicationCount >= threshold\n| extend 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",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1078"
        ],
        "templateVersion": "1.0.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}