Attempt to bypass conditional access rule in Azure AD

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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	1.0.4
Arm template	3af9285d-bb98-4a35-ad29-5ea39ba0c628.json

KQL

let threshold = 1; // Modify this threshold value to reduce false positives based on your environment
let aadFunc = (tableName:string){
table(tableName)
| where ConditionalAccessStatus == 1 or ConditionalAccessStatus =~ "failure"
| mv-apply CAP = parse_json(ConditionalAccessPolicies) 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,10), StatusDetails = make_list(StatusDetails,50), IPAddresses = make_list(IPAddress,100), IPAddressCount = dcount(IPAddress), CorrelationIds = make_list(CorrelationId,100), ConditionalAccessPoliciesName = make_list(ConditionalAccessPoliciesName,100)
by UserPrincipalName, AppDisplayName, tostring(Browser), tostring(OS), City, State, Region, Type
| where IPAddressCount > threshold and StatusDetails !has "MFA successfully completed"
| mv-expand IPAddresses, Status, StatusDetails, CorrelationIds
| extend Status = strcat(Status, " ", StatusDetails)
| summarize IPAddresses = make_set(IPAddresses,100), Status = make_set(Status,10), CorrelationIds = make_set(CorrelationIds,100), ConditionalAccessPoliciesName = make_set(ConditionalAccessPoliciesName,100)
by StartTime, EndTime, UserPrincipalName, AppDisplayName, tostring(Browser), tostring(OS), City, State, Region, IPAddressCount, Type
| extend timestamp = StartTime, IPAddresses = tostring(IPAddresses), 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

YAML

severity: Low
name: Attempt to bypass conditional access rule in Azure AD
requiredDataConnectors:
- dataTypes:
  - SigninLogs
  connectorId: AzureActiveDirectory
- dataTypes:
  - AADNonInteractiveUserSignInLogs
  connectorId: AzureActiveDirectory
id: 3af9285d-bb98-4a35-ad29-5ea39ba0c628
tactics:
- InitialAccess
- Persistence
queryFrequency: 1d
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/BypassCondAccessRule.yaml
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'  
triggerThreshold: 0
kind: Scheduled
relevantTechniques:
- T1078
- T1098
query: |
  let threshold = 1; // Modify this threshold value to reduce false positives based on your environment
  let aadFunc = (tableName:string){
  table(tableName)
  | where ConditionalAccessStatus == 1 or ConditionalAccessStatus =~ "failure"
  | mv-apply CAP = parse_json(ConditionalAccessPolicies) 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,10), StatusDetails = make_list(StatusDetails,50), IPAddresses = make_list(IPAddress,100), IPAddressCount = dcount(IPAddress), CorrelationIds = make_list(CorrelationId,100), ConditionalAccessPoliciesName = make_list(ConditionalAccessPoliciesName,100)
  by UserPrincipalName, AppDisplayName, tostring(Browser), tostring(OS), City, State, Region, Type
  | where IPAddressCount > threshold and StatusDetails !has "MFA successfully completed"
  | mv-expand IPAddresses, Status, StatusDetails, CorrelationIds
  | extend Status = strcat(Status, " ", StatusDetails)
  | summarize IPAddresses = make_set(IPAddresses,100), Status = make_set(Status,10), CorrelationIds = make_set(CorrelationIds,100), ConditionalAccessPoliciesName = make_set(ConditionalAccessPoliciesName,100)
  by StartTime, EndTime, UserPrincipalName, AppDisplayName, tostring(Browser), tostring(OS), City, State, Region, IPAddressCount, Type
  | extend timestamp = StartTime, IPAddresses = tostring(IPAddresses), 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  
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: Name
    identifier: Name
  - columnName: UPNSuffix
    identifier: UPNSuffix
- entityType: IP
  fieldMappings:
  - columnName: IPAddresses
    identifier: Address
status: Available
version: 1.0.4
queryPeriod: 1d

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-preview",
      "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; // Modify this threshold value to reduce false positives based on your environment\nlet aadFunc = (tableName:string){\ntable(tableName)\n| where ConditionalAccessStatus == 1 or ConditionalAccessStatus =~ \"failure\"\n| mv-apply CAP = parse_json(ConditionalAccessPolicies) 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,10), StatusDetails = make_list(StatusDetails,50), IPAddresses = make_list(IPAddress,100), IPAddressCount = dcount(IPAddress), CorrelationIds = make_list(CorrelationId,100), ConditionalAccessPoliciesName = make_list(ConditionalAccessPoliciesName,100)\nby UserPrincipalName, AppDisplayName, tostring(Browser), tostring(OS), City, State, Region, Type\n| where IPAddressCount > threshold and StatusDetails !has \"MFA successfully completed\"\n| mv-expand IPAddresses, Status, StatusDetails, CorrelationIds\n| extend Status = strcat(Status, \" \", StatusDetails)\n| summarize IPAddresses = make_set(IPAddresses,100), Status = make_set(Status,10), CorrelationIds = make_set(CorrelationIds,100), ConditionalAccessPoliciesName = make_set(ConditionalAccessPoliciesName,100)\nby StartTime, EndTime, UserPrincipalName, AppDisplayName, tostring(Browser), tostring(OS), City, State, Region, IPAddressCount, Type\n| extend timestamp = StartTime, IPAddresses = tostring(IPAddresses), 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": [
          "InitialAccess",
          "Persistence"
        ],
        "techniques": [
          "T1078",
          "T1098"
        ],
        "alertRuleTemplateName": "3af9285d-bb98-4a35-ad29-5ea39ba0c628",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "Name",
                "columnName": "Name"
              },
              {
                "identifier": "UPNSuffix",
                "columnName": "UPNSuffix"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPAddresses"
              }
            ],
            "entityType": "IP"
          }
        ],
        "status": "Available",
        "templateVersion": "1.0.4",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/BypassCondAccessRule.yaml"
      }
    }
  ]
}