CYFIRMA - Public Accounts Leaks Detection Rule

Back


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

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

ARM