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

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

ARM