Cisco - firewall block but success logon to Microsoft Entra ID

let aadFunc = (tableName:string){
CommonSecurityLog
| where DeviceVendor =~ "Cisco"
| where DeviceAction =~ "denied"
| where ipv4_is_private(SourceIP) == false
| summarize count() by SourceIP
| join (
    // Successful signins from IPs blocked by the firewall solution are suspect
    // Include fully successful sign-ins, but also ones that failed only at MFA stage
    // as that supposes the password was sucessfully guessed.
  table(tableName)
  | where ResultType in ("0", "50074", "50076")
) on $left.SourceIP == $right.IPAddress
| extend AccountName = tostring(split(Account, "@")[0]), AccountUPNSuffix = tostring(split(Account, "@")[1])
};
let aadSignin = aadFunc("SigninLogs");
let aadNonInt = aadFunc("AADNonInteractiveUserSignInLogs");
union isfuzzy=true aadSignin, aadNonInt

entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: UserPrincipalName
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: AccountUPNSuffix
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: SourceIP
name: Cisco - firewall block but success logon to Microsoft Entra ID
kind: Scheduled
queryFrequency: 1d
triggerOperator: gt
queryPeriod: 1d
requiredDataConnectors:
- connectorId: CiscoASA
  dataTypes:
  - CommonSecurityLog
- connectorId: AzureActiveDirectory
  dataTypes:
  - SigninLogs
- connectorId: AzureActiveDirectory
  dataTypes:
  - AADNonInteractiveUserSignInLogs
tactics:
- InitialAccess
description: |
  'Correlate IPs blocked by a Cisco firewall appliance with successful Microsoft Entra ID signins.
  Because the IP was blocked by the firewall, that same IP logging on successfully to Entra ID is potentially suspect and could indicate credential compromise for the user account.'
severity: Medium
id: 157c0cfc-d76d-463b-8755-c781608cdc1a
metadata:
  author:
    name: Microsoft Security Resarch
  categories:
    domains:
    - Security - Network
  source:
    kind: Community
  support:
    tier: Community
triggerThreshold: 0
query: |
  let aadFunc = (tableName:string){
  CommonSecurityLog
  | where DeviceVendor =~ "Cisco"
  | where DeviceAction =~ "denied"
  | where ipv4_is_private(SourceIP) == false
  | summarize count() by SourceIP
  | join (
      // Successful signins from IPs blocked by the firewall solution are suspect
      // Include fully successful sign-ins, but also ones that failed only at MFA stage
      // as that supposes the password was sucessfully guessed.
    table(tableName)
    | where ResultType in ("0", "50074", "50076")
  ) on $left.SourceIP == $right.IPAddress
  | extend AccountName = tostring(split(Account, "@")[0]), AccountUPNSuffix = tostring(split(Account, "@")[1])
  };
  let aadSignin = aadFunc("SigninLogs");
  let aadNonInt = aadFunc("AADNonInteractiveUserSignInLogs");
  union isfuzzy=true aadSignin, aadNonInt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/SigninFirewallCorrelation.yaml
version: 1.0.6
relevantTechniques:
- T1078

{
  "$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/157c0cfc-d76d-463b-8755-c781608cdc1a')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/157c0cfc-d76d-463b-8755-c781608cdc1a')]",
      "properties": {
        "alertRuleTemplateName": "157c0cfc-d76d-463b-8755-c781608cdc1a",
        "customDetails": null,
        "description": "'Correlate IPs blocked by a Cisco firewall appliance with successful Microsoft Entra ID signins.\nBecause the IP was blocked by the firewall, that same IP logging on successfully to Entra ID is potentially suspect and could indicate credential compromise for the user account.'\n",
        "displayName": "Cisco - firewall block but success logon to Microsoft Entra ID",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "UserPrincipalName",
                "identifier": "FullName"
              },
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountUPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SourceIP",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/SigninFirewallCorrelation.yaml",
        "query": "let aadFunc = (tableName:string){\nCommonSecurityLog\n| where DeviceVendor =~ \"Cisco\"\n| where DeviceAction =~ \"denied\"\n| where ipv4_is_private(SourceIP) == false\n| summarize count() by SourceIP\n| join (\n    // Successful signins from IPs blocked by the firewall solution are suspect\n    // Include fully successful sign-ins, but also ones that failed only at MFA stage\n    // as that supposes the password was sucessfully guessed.\n  table(tableName)\n  | where ResultType in (\"0\", \"50074\", \"50076\")\n) on $left.SourceIP == $right.IPAddress\n| extend AccountName = tostring(split(Account, \"@\")[0]), AccountUPNSuffix = tostring(split(Account, \"@\")[1])\n};\nlet aadSignin = aadFunc(\"SigninLogs\");\nlet aadNonInt = aadFunc(\"AADNonInteractiveUserSignInLogs\");\nunion isfuzzy=true aadSignin, aadNonInt\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1078"
        ],
        "templateVersion": "1.0.6",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}