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

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Id	57602938-e95a-4fc3-9352-8d473ed256e1
Rulename	CYFIRMA - Public Accounts Leaks Detection Rule
Description	“Detects exposed public-facing account credentials as identified in CYFIRMA’s threat intelligence feeds. This rule monitors for credentials leaked through third-party breaches, dark web sources, or public repositories that could impact the organization’s users or systems. It captures key details such as email, username, IP address, and associated devices. These accounts may not be directly managed by the enterprise but still pose a risk of lateral access, shadow IT, or third-party exposure.”
Severity	High
Tactics	CredentialAccess InitialAccess Discovery
Techniques	T1078 T1087 T1552
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/PublicAccountsLeaksRule.yaml
Version	1.0.1
Arm template	57602938-e95a-4fc3-9352-8d473ed256e1.json

KQL

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

YAML

queryFrequency: 5m
entityMappings:
- fieldMappings:
  - columnName: user_name
    identifier: Name
  - columnName: email
    identifier: UPNSuffix
  entityType: Account
- fieldMappings:
  - columnName: computer_name
    identifier: HostName
  - columnName: operating_system
    identifier: OSVersion
  entityType: Host
- fieldMappings:
  - columnName: ip
    identifier: Address
  entityType: IP
- fieldMappings:
  - columnName: url
    identifier: Url
  entityType: URL
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    lookbackDuration: PT5H
    matchingMethod: AllEntities
    enabled: false
    reopenClosedIncident: false
triggerThreshold: 0
suppressionEnabled: true
triggerOperator: gt
severity: High
suppressionDuration: 6h
eventGroupingSettings:
  aggregationKind: AlertPerResult
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma%20Compromised%20Accounts/Analytic%20Rules/PublicAccountsLeaksRule.yaml
alertDetailsOverride:
  alertDisplayNameFormat: Public Leak - {{user_name}} - {{email}}
  alertDynamicProperties:
  - alertProperty: ProductName
    value: ProductName
  - alertProperty: ProviderName
    value: ProviderName
  alertDescriptionFormat: '{{description}}'
query: |
  // Public Accounts Leaks - Latest per UID
  let timeFrame = 5m;
  CyfirmaCompromisedAccounts_CL
  | where TimeGenerated between (ago(timeFrame) .. now())
      and Category has "Public Accounts Leaks"
  | extend 
      ProviderName = 'CYFIRMA',
      ProductName = 'DeCYFIR/DeTCT'
  | summarize arg_max(TimeGenerated, 
      email,
      user_name,
      password,
      url,
      ip,
      computer_name,
      operating_system,
      breach_date,
      first_seen,
      last_seen,
      impact,
      recommendations,
      description,
      source,
      ProductName,
      ProviderName
  ) by uid
  | sort by TimeGenerated desc
tactics:
- CredentialAccess
- InitialAccess
- Discovery
queryPeriod: 5m
customDetails:
  Source: source
  TimeGenerated: TimeGenerated
  BreachDate: breach_date
  Impact: impact
  Recommendations: recommendations
  FirstSeen: first_seen
  UID: uid
  Description: description
  LastSeen: last_seen
relevantTechniques:
- T1078
- T1087
- T1552
requiredDataConnectors:
- connectorId: CyfirmaCompromisedAccountsDataConnector
  dataTypes:
  - CyfirmaCompromisedAccounts_CL
id: 57602938-e95a-4fc3-9352-8d473ed256e1
version: 1.0.1
description: |
  "Detects exposed public-facing account credentials as identified in CYFIRMA's threat intelligence feeds.
  This rule monitors for credentials leaked through third-party breaches, dark web sources, or public repositories that could impact the organization's users or systems.
  It captures key details such as email, username, IP address, and associated devices. These accounts may not be directly managed by the enterprise but still pose a risk of lateral access, shadow IT, or third-party exposure."
kind: Scheduled
name: CYFIRMA - Public Accounts Leaks Detection Rule
status: Available

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/57602938-e95a-4fc3-9352-8d473ed256e1')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/57602938-e95a-4fc3-9352-8d473ed256e1')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "{{description}}",
          "alertDisplayNameFormat": "Public Leak - {{user_name}} - {{email}}",
          "alertDynamicProperties": [
            {
              "alertProperty": "ProductName",
              "value": "ProductName"
            },
            {
              "alertProperty": "ProviderName",
              "value": "ProviderName"
            }
          ]
        },
        "alertRuleTemplateName": "57602938-e95a-4fc3-9352-8d473ed256e1",
        "customDetails": {
          "BreachDate": "breach_date",
          "Description": "description",
          "FirstSeen": "first_seen",
          "Impact": "impact",
          "LastSeen": "last_seen",
          "Recommendations": "recommendations",
          "Source": "source",
          "TimeGenerated": "TimeGenerated",
          "UID": "uid"
        },
        "description": "\"Detects exposed public-facing account credentials as identified in CYFIRMA's threat intelligence feeds.\nThis rule monitors for credentials leaked through third-party breaches, dark web sources, or public repositories that could impact the organization's users or systems.\nIt captures key details such as email, username, IP address, and associated devices. These accounts may not be directly managed by the enterprise but still pose a risk of lateral access, shadow IT, or third-party exposure.\"\n",
        "displayName": "CYFIRMA - Public Accounts Leaks Detection Rule",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "user_name",
                "identifier": "Name"
              },
              {
                "columnName": "email",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "computer_name",
                "identifier": "HostName"
              },
              {
                "columnName": "operating_system",
                "identifier": "OSVersion"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "ip",
                "identifier": "Address"
              }
            ]
          },
          {
            "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/PublicAccountsLeaksRule.yaml",
        "query": "// Public Accounts Leaks - Latest per UID\nlet timeFrame = 5m;\nCyfirmaCompromisedAccounts_CL\n| where TimeGenerated between (ago(timeFrame) .. now())\n    and Category has \"Public Accounts Leaks\"\n| extend \n    ProviderName = 'CYFIRMA',\n    ProductName = 'DeCYFIR/DeTCT'\n| summarize arg_max(TimeGenerated, \n    email,\n    user_name,\n    password,\n    url,\n    ip,\n    computer_name,\n    operating_system,\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",
          "Discovery",
          "InitialAccess"
        ],
        "techniques": [
          "T1078",
          "T1087",
          "T1552"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}