Attempt to bypass conditional access rule in Azure AD

Back


Id	3af9285d-bb98-4a35-ad29-5ea39ba0c628
Rulename	Attempt to bypass conditional access rule in Azure AD
Description	Identifies an attempt to Bypass conditional access rule(s) in Azure Active Directory. The ConditionalAccessStatus column value details if there was an attempt to bypass Conditional Access or if the Conditional access rule was not satisfied (ConditionalAccessStatus == 1). References: https://docs.microsoft.com/azure/active-directory/conditional-access/overview https://docs.microsoft.com/azure/active-directory/reports-monitoring/concept-sign-ins https://docs.microsoft.com/azure/active-directory/reports-monitoring/reference-sign-ins-error-codes ConditionalAccessStatus == 0 // Success ConditionalAccessStatus == 1 // Failure ConditionalAccessStatus == 2 // Not Applied ConditionalAccessStatus == 3 // unknown
Severity	Low
Tactics	InitialAccess Persistence
Techniques	T1078 T1098
Required data connectors	AzureActiveDirectory
Kind	Scheduled
Query frequency	1d
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/BypassCondAccessRule.yaml
Version	1.0.3
Arm template	3af9285d-bb98-4a35-ad29-5ea39ba0c628.json

KQL

let threshold = 1;
let aadFunc = (tableName:string){
table(tableName)
| where ConditionalAccessStatus == 1 or ConditionalAccessStatus =~ "failure"
| extend CAP = parse_json(ConditionalAccessPolicies)
| mv-apply CAP on (
  project ConditionalAccessPoliciesName = CAP.displayName, result = CAP.result
  | where result =~ "failure"
)
| extend DeviceDetail = todynamic(DeviceDetail), Status = todynamic(Status), LocationDetails = todynamic(LocationDetails)
| extend OS = DeviceDetail.operatingSystem, Browser = DeviceDetail.browser
| extend State = tostring(LocationDetails.state), City = tostring(LocationDetails.city), Region = tostring(LocationDetails.countryOrRegion)
| extend StatusCode = tostring(Status.errorCode), StatusDetails = tostring(Status.additionalDetails)
| extend Status = strcat(StatusCode, ": ", ResultDescription)
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), Status = make_list(Status), StatusDetails = make_list(StatusDetails), IPAddresses = make_list(IPAddress), IPAddressCount = dcount(IPAddress), CorrelationIds = make_list(CorrelationId), ConditionalAccessPoliciesName = make_list(ConditionalAccessPoliciesName)
by UserPrincipalName, AppDisplayName, tostring(Browser), tostring(OS), City, State, Region, Type
| where IPAddressCount > threshold and StatusDetails !has "MFA successfully completed"
| mvexpand IPAddresses, Status, StatusDetails, CorrelationIds
| extend Status = strcat(Status, " ", StatusDetails)
| summarize IPAddresses = make_set(IPAddresses), Status = make_set(Status), CorrelationIds = make_set(CorrelationIds), ConditionalAccessPoliciesName = make_set(ConditionalAccessPoliciesName)
by StartTime, EndTime, UserPrincipalName, AppDisplayName, tostring(Browser), tostring(OS), City, State, Region, IPAddressCount, Type
| extend timestamp = StartTime, AccountCustomEntity = UserPrincipalName, IPCustomEntity = tostring(IPAddresses)
};
let aadSignin = aadFunc("SigninLogs");
let aadNonInt = aadFunc("AADNonInteractiveUserSignInLogs");
union isfuzzy=true aadSignin, aadNonInt

YAML

queryPeriod: 1d
version: 1.0.3
relevantTechniques:
- T1078
- T1098
queryFrequency: 1d
kind: Scheduled
name: Attempt to bypass conditional access rule in Azure AD
id: 3af9285d-bb98-4a35-ad29-5ea39ba0c628
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
  entityType: Account
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/BypassCondAccessRule.yaml
severity: Low
query: |
  let threshold = 1;
  let aadFunc = (tableName:string){
  table(tableName)
  | where ConditionalAccessStatus == 1 or ConditionalAccessStatus =~ "failure"
  | extend CAP = parse_json(ConditionalAccessPolicies)
  | mv-apply CAP on (
    project ConditionalAccessPoliciesName = CAP.displayName, result = CAP.result
    | where result =~ "failure"
  )
  | extend DeviceDetail = todynamic(DeviceDetail), Status = todynamic(Status), LocationDetails = todynamic(LocationDetails)
  | extend OS = DeviceDetail.operatingSystem, Browser = DeviceDetail.browser
  | extend State = tostring(LocationDetails.state), City = tostring(LocationDetails.city), Region = tostring(LocationDetails.countryOrRegion)
  | extend StatusCode = tostring(Status.errorCode), StatusDetails = tostring(Status.additionalDetails)
  | extend Status = strcat(StatusCode, ": ", ResultDescription)
  | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), Status = make_list(Status), StatusDetails = make_list(StatusDetails), IPAddresses = make_list(IPAddress), IPAddressCount = dcount(IPAddress), CorrelationIds = make_list(CorrelationId), ConditionalAccessPoliciesName = make_list(ConditionalAccessPoliciesName)
  by UserPrincipalName, AppDisplayName, tostring(Browser), tostring(OS), City, State, Region, Type
  | where IPAddressCount > threshold and StatusDetails !has "MFA successfully completed"
  | mvexpand IPAddresses, Status, StatusDetails, CorrelationIds
  | extend Status = strcat(Status, " ", StatusDetails)
  | summarize IPAddresses = make_set(IPAddresses), Status = make_set(Status), CorrelationIds = make_set(CorrelationIds), ConditionalAccessPoliciesName = make_set(ConditionalAccessPoliciesName)
  by StartTime, EndTime, UserPrincipalName, AppDisplayName, tostring(Browser), tostring(OS), City, State, Region, IPAddressCount, Type
  | extend timestamp = StartTime, AccountCustomEntity = UserPrincipalName, IPCustomEntity = tostring(IPAddresses)
  };
  let aadSignin = aadFunc("SigninLogs");
  let aadNonInt = aadFunc("AADNonInteractiveUserSignInLogs");
  union isfuzzy=true aadSignin, aadNonInt  
tactics:
- InitialAccess
- Persistence
description: |
  'Identifies an attempt to Bypass conditional access rule(s) in Azure Active Directory.
  The ConditionalAccessStatus column value details if there was an attempt to bypass Conditional Access
  or if the Conditional access rule was not satisfied (ConditionalAccessStatus == 1).
  References:
  https://docs.microsoft.com/azure/active-directory/conditional-access/overview
  https://docs.microsoft.com/azure/active-directory/reports-monitoring/concept-sign-ins
  https://docs.microsoft.com/azure/active-directory/reports-monitoring/reference-sign-ins-error-codes
  ConditionalAccessStatus == 0 // Success
  ConditionalAccessStatus == 1 // Failure
  ConditionalAccessStatus == 2 // Not Applied
  ConditionalAccessStatus == 3 // unknown'  
requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - SigninLogs
- connectorId: AzureActiveDirectory
  dataTypes:
  - AADNonInteractiveUserSignInLogs
status: Available
triggerThreshold: 0
triggerOperator: gt

ARM

{
  "$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/3af9285d-bb98-4a35-ad29-5ea39ba0c628')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/3af9285d-bb98-4a35-ad29-5ea39ba0c628')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Attempt to bypass conditional access rule in Azure AD",
        "description": "'Identifies an attempt to Bypass conditional access rule(s) in Azure Active Directory.\nThe ConditionalAccessStatus column value details if there was an attempt to bypass Conditional Access\nor if the Conditional access rule was not satisfied (ConditionalAccessStatus == 1).\nReferences:\nhttps://docs.microsoft.com/azure/active-directory/conditional-access/overview\nhttps://docs.microsoft.com/azure/active-directory/reports-monitoring/concept-sign-ins\nhttps://docs.microsoft.com/azure/active-directory/reports-monitoring/reference-sign-ins-error-codes\nConditionalAccessStatus == 0 // Success\nConditionalAccessStatus == 1 // Failure\nConditionalAccessStatus == 2 // Not Applied\nConditionalAccessStatus == 3 // unknown'\n",
        "severity": "Low",
        "enabled": true,
        "query": "let threshold = 1;\nlet aadFunc = (tableName:string){\ntable(tableName)\n| where ConditionalAccessStatus == 1 or ConditionalAccessStatus =~ \"failure\"\n| extend CAP = parse_json(ConditionalAccessPolicies)\n| mv-apply CAP on (\n  project ConditionalAccessPoliciesName = CAP.displayName, result = CAP.result\n  | where result =~ \"failure\"\n)\n| extend DeviceDetail = todynamic(DeviceDetail), Status = todynamic(Status), LocationDetails = todynamic(LocationDetails)\n| extend OS = DeviceDetail.operatingSystem, Browser = DeviceDetail.browser\n| extend State = tostring(LocationDetails.state), City = tostring(LocationDetails.city), Region = tostring(LocationDetails.countryOrRegion)\n| extend StatusCode = tostring(Status.errorCode), StatusDetails = tostring(Status.additionalDetails)\n| extend Status = strcat(StatusCode, \": \", ResultDescription)\n| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), Status = make_list(Status), StatusDetails = make_list(StatusDetails), IPAddresses = make_list(IPAddress), IPAddressCount = dcount(IPAddress), CorrelationIds = make_list(CorrelationId), ConditionalAccessPoliciesName = make_list(ConditionalAccessPoliciesName)\nby UserPrincipalName, AppDisplayName, tostring(Browser), tostring(OS), City, State, Region, Type\n| where IPAddressCount > threshold and StatusDetails !has \"MFA successfully completed\"\n| mvexpand IPAddresses, Status, StatusDetails, CorrelationIds\n| extend Status = strcat(Status, \" \", StatusDetails)\n| summarize IPAddresses = make_set(IPAddresses), Status = make_set(Status), CorrelationIds = make_set(CorrelationIds), ConditionalAccessPoliciesName = make_set(ConditionalAccessPoliciesName)\nby StartTime, EndTime, UserPrincipalName, AppDisplayName, tostring(Browser), tostring(OS), City, State, Region, IPAddressCount, Type\n| extend timestamp = StartTime, AccountCustomEntity = UserPrincipalName, IPCustomEntity = tostring(IPAddresses)\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": [
          "InitialAccess",
          "Persistence"
        ],
        "techniques": [
          "T1078",
          "T1098"
        ],
        "alertRuleTemplateName": "3af9285d-bb98-4a35-ad29-5ea39ba0c628",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AccountCustomEntity"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ],
            "entityType": "IP"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/BypassCondAccessRule.yaml",
        "status": "Available",
        "templateVersion": "1.0.3"
      }
    }
  ]
}