CYFIRMA - Public Accounts Leaks Detection Rule

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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 Compromised Accounts/Analytic Rules/PublicAccountsLeaksRule.yaml
Version	1.0.0
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

tactics:
- CredentialAccess
- InitialAccess
- Discovery
name: CYFIRMA - Public Accounts Leaks Detection Rule
suppressionEnabled: true
requiredDataConnectors:
- connectorId: CyfirmaCompromisedAccountsDataConnector
  dataTypes:
  - CyfirmaCompromisedAccounts_CL
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  
eventGroupingSettings:
  aggregationKind: AlertPerResult
relevantTechniques:
- T1078
- T1087
- T1552
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    matchingMethod: AllEntities
    reopenClosedIncident: false
    lookbackDuration: 5h
    enabled: false
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."  
triggerOperator: gt
queryPeriod: 5m
suppressionDuration: 6h
severity: High
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: user_name
  - identifier: UPNSuffix
    columnName: email
  entityType: Account
- fieldMappings:
  - identifier: HostName
    columnName: computer_name
  - identifier: OSVersion
    columnName: operating_system
  entityType: Host
- fieldMappings:
  - identifier: Address
    columnName: ip
  entityType: IP
- fieldMappings:
  - identifier: Url
    columnName: url
  entityType: URL
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Compromised Accounts/Analytic Rules/PublicAccountsLeaksRule.yaml
version: 1.0.0
alertDetailsOverride:
  alertDynamicProperties:
  - alertProperty: ProductName
    value: ProductName
  - alertProperty: ProviderName
    value: ProviderName
  alertDisplayNameFormat: Public Leak - {{user_name}} - {{email}}
  alertDescriptionFormat: '{{description}}'
triggerThreshold: 0
id: 57602938-e95a-4fc3-9352-8d473ed256e1
queryFrequency: 5m
kind: Scheduled
status: Available
customDetails:
  Recommendations: recommendations
  Description: description
  FirstSeen: first_seen
  TimeGenerated: TimeGenerated
  Source: source
  BreachDate: breach_date
  LastSeen: last_seen
  Impact: impact
  UID: uid

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 Compromised Accounts/Analytic Rules/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": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}