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	1.0.1
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

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."  
tactics:
- CredentialAccess
- InitialAccess
- Discovery
suppressionEnabled: true
suppressionDuration: 6h
requiredDataConnectors:
- dataTypes:
  - CyfirmaCompromisedAccounts_CL
  connectorId: CyfirmaCompromisedAccountsDataConnector
alertDetailsOverride:
  alertDisplayNameFormat: Public Leak - {{user_name}} - {{email}}
  alertDescriptionFormat: '{{description}}'
  alertDynamicProperties:
  - value: ProductName
    alertProperty: ProductName
  - value: ProviderName
    alertProperty: ProviderName
incidentConfiguration:
  groupingConfiguration:
    enabled: false
    lookbackDuration: PT5H
    reopenClosedIncident: false
    matchingMethod: AllEntities
  createIncident: true
id: 57602938-e95a-4fc3-9352-8d473ed256e1
severity: High
eventGroupingSettings:
  aggregationKind: AlertPerResult
status: Available
customDetails:
  UID: uid
  Recommendations: recommendations
  LastSeen: last_seen
  Impact: impact
  FirstSeen: first_seen
  BreachDate: breach_date
  Description: description
  Source: source
  TimeGenerated: TimeGenerated
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  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Compromised Accounts/Analytic Rules/PublicAccountsLeaksRule.yaml
kind: Scheduled
queryPeriod: 5m
name: CYFIRMA - Public Accounts Leaks Detection Rule
queryFrequency: 5m
triggerThreshold: 0
relevantTechniques:
- T1078
- T1087
- T1552
version: 1.0.1
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: user_name
  - identifier: UPNSuffix
    columnName: email
- entityType: Host
  fieldMappings:
  - identifier: HostName
    columnName: computer_name
  - identifier: OSVersion
    columnName: operating_system
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: ip
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: url
triggerOperator: gt

ARM