CYFIRMA - Customer Accounts Leaks Detection Rule

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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 Compromised Accounts/Analytic Rules/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

suppressionDuration: 6h
name: CYFIRMA - Customer Accounts Leaks Detection Rule
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Compromised Accounts/Analytic Rules/CustomerAccountsLeaksRule.yaml
severity: High
suppressionEnabled: true
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."  
version: 1.0.1
customDetails:
  FirstSeen: first_seen
  BreachDate: breach_date
  Source: source
  Impact: impact
  UID: uid
  LastSeen: last_seen
  Recommendations: recommendations
  TimeGenerated: TimeGenerated
  Description: description
requiredDataConnectors:
- dataTypes:
  - CyfirmaCompromisedAccounts_CL
  connectorId: CyfirmaCompromisedAccountsDataConnector
tactics:
- CredentialAccess
- InitialAccess
relevantTechniques:
- T1552
- T1078
kind: Scheduled
triggerThreshold: 0
id: ebd1bf8d-aa18-4e66-9cad-555b71a290f1
queryPeriod: 5m
incidentConfiguration:
  groupingConfiguration:
    reopenClosedIncident: false
    lookbackDuration: PT5H
    matchingMethod: AllEntities
    enabled: false
  createIncident: true
alertDetailsOverride:
  alertDescriptionFormat: '{{description}}'
  alertDisplayNameFormat: Customer Leak - {{user_name}} - {{email}}
  alertDynamicProperties:
  - value: ProductName
    alertProperty: ProductName
  - value: ProviderName
    alertProperty: ProviderName
triggerOperator: gt
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  
status: Available
eventGroupingSettings:
  aggregationKind: AlertPerResult
queryFrequency: 5m
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: user_name
  - identifier: UPNSuffix
    columnName: email
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: url

ARM