CYFIRMA - Customer Accounts Leaks Detection Rule | Microsoft Sentinel Analytic Rules

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Id	ebd1bf8d-aa18-4e66-9cad-555b71a290f1
Rulename	CYFIRMA - Customer Accounts Leaks Detection Rule
Description	“Detects recent leaks of customer account credentials based on CYFIRMA’s threat intelligence. This rule surfaces the latest credential exposures, including email, username, and breach metadata. It enables security teams to quickly identify and investigate leaked customer data from third-party breaches, dark web listings, or public repositories.”
Severity	High
Tactics	CredentialAccess InitialAccess
Techniques	T1552 T1078
Required data connectors	CyfirmaCompromisedAccountsDataConnector
Kind	Scheduled
Query frequency	5m
Query period	5m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma%20Compromised%20Accounts/Analytic%20Rules/CustomerAccountsLeaksRule.yaml
Version	1.0.1
Arm template	ebd1bf8d-aa18-4e66-9cad-555b71a290f1.json

KQL

// Customer Accounts Leaks - Latest per UID
let timeFrame = 5m;
CyfirmaCompromisedAccounts_CL
| where TimeGenerated between (ago(timeFrame) .. now())
    and Category has "Customer Accounts Leaks"
| extend 
    ProviderName = 'CYFIRMA',
    ProductName = 'DeCYFIR/DeTCT'
| summarize arg_max(TimeGenerated, 
    user_name,
    email,
    url,
    password,
    breach_date,
    first_seen,
    last_seen,
    impact,
    recommendations,
    description,
    source,
    ProductName,
    ProviderName
) by uid
| sort by TimeGenerated desc

YAML

severity: High
tactics:
- CredentialAccess
- InitialAccess
queryFrequency: 5m
id: ebd1bf8d-aa18-4e66-9cad-555b71a290f1
query: |
  // Customer Accounts Leaks - Latest per UID
  let timeFrame = 5m;
  CyfirmaCompromisedAccounts_CL
  | where TimeGenerated between (ago(timeFrame) .. now())
      and Category has "Customer Accounts Leaks"
  | extend 
      ProviderName = 'CYFIRMA',
      ProductName = 'DeCYFIR/DeTCT'
  | summarize arg_max(TimeGenerated, 
      user_name,
      email,
      url,
      password,
      breach_date,
      first_seen,
      last_seen,
      impact,
      recommendations,
      description,
      source,
      ProductName,
      ProviderName
  ) by uid
  | sort by TimeGenerated desc
suppressionDuration: 6h
incidentConfiguration:
  groupingConfiguration:
    lookbackDuration: PT5H
    matchingMethod: AllEntities
    reopenClosedIncident: false
    enabled: false
  createIncident: true
customDetails:
  Impact: impact
  TimeGenerated: TimeGenerated
  UID: uid
  Source: source
  Recommendations: recommendations
  FirstSeen: first_seen
  LastSeen: last_seen
  BreachDate: breach_date
  Description: description
kind: Scheduled
triggerOperator: gt
name: CYFIRMA - Customer Accounts Leaks Detection Rule
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: user_name
  - identifier: UPNSuffix
    columnName: email
  entityType: Account
- fieldMappings:
  - identifier: Url
    columnName: url
  entityType: URL
version: 1.0.1
status: Available
requiredDataConnectors:
- dataTypes:
  - CyfirmaCompromisedAccounts_CL
  connectorId: CyfirmaCompromisedAccountsDataConnector
description: |
  "Detects recent leaks of customer account credentials based on CYFIRMA's threat intelligence.
    This rule surfaces the latest credential exposures, including email, username, and breach metadata.
    It enables security teams to quickly identify and investigate leaked customer data from third-party breaches, dark web listings, or public repositories."
relevantTechniques:
- T1552
- T1078
queryPeriod: 5m
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma%20Compromised%20Accounts/Analytic%20Rules/CustomerAccountsLeaksRule.yaml
triggerThreshold: 0
suppressionEnabled: true
eventGroupingSettings:
  aggregationKind: AlertPerResult
alertDetailsOverride:
  alertDisplayNameFormat: Customer Leak - {{user_name}} - {{email}}
  alertDescriptionFormat: '{{description}}'
  alertDynamicProperties:
  - alertProperty: ProductName
    value: ProductName
  - alertProperty: ProviderName
    value: ProviderName

ARM

{
  "$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/ebd1bf8d-aa18-4e66-9cad-555b71a290f1')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/ebd1bf8d-aa18-4e66-9cad-555b71a290f1')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "{{description}}",
          "alertDisplayNameFormat": "Customer Leak - {{user_name}} - {{email}}",
          "alertDynamicProperties": [
            {
              "alertProperty": "ProductName",
              "value": "ProductName"
            },
            {
              "alertProperty": "ProviderName",
              "value": "ProviderName"
            }
          ]
        },
        "alertRuleTemplateName": "ebd1bf8d-aa18-4e66-9cad-555b71a290f1",
        "customDetails": {
          "BreachDate": "breach_date",
          "Description": "description",
          "FirstSeen": "first_seen",
          "Impact": "impact",
          "LastSeen": "last_seen",
          "Recommendations": "recommendations",
          "Source": "source",
          "TimeGenerated": "TimeGenerated",
          "UID": "uid"
        },
        "description": "\"Detects recent leaks of customer account credentials based on CYFIRMA's threat intelligence.\n  This rule surfaces the latest credential exposures, including email, username, and breach metadata.\n  It enables security teams to quickly identify and investigate leaked customer data from third-party breaches, dark web listings, or public repositories.\"\n",
        "displayName": "CYFIRMA - Customer Accounts Leaks Detection Rule",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "user_name",
                "identifier": "Name"
              },
              {
                "columnName": "email",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "url",
                "identifier": "Url"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": false,
            "lookbackDuration": "PT5H",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma%20Compromised%20Accounts/Analytic%20Rules/CustomerAccountsLeaksRule.yaml",
        "query": "// Customer Accounts Leaks - Latest per UID\nlet timeFrame = 5m;\nCyfirmaCompromisedAccounts_CL\n| where TimeGenerated between (ago(timeFrame) .. now())\n    and Category has \"Customer Accounts Leaks\"\n| extend \n    ProviderName = 'CYFIRMA',\n    ProductName = 'DeCYFIR/DeTCT'\n| summarize arg_max(TimeGenerated, \n    user_name,\n    email,\n    url,\n    password,\n    breach_date,\n    first_seen,\n    last_seen,\n    impact,\n    recommendations,\n    description,\n    source,\n    ProductName,\n    ProviderName\n) by uid\n| sort by TimeGenerated desc\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT6H",
        "suppressionEnabled": true,
        "tactics": [
          "CredentialAccess",
          "InitialAccess"
        ],
        "techniques": [
          "T1078",
          "T1552"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}