CYFIRMA - Compromised Employees Detection Rule

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Id	72d3fb86-d1eb-44d6-9352-170c6bb45bb7
Rulename	CYFIRMA - Compromised Employees Detection Rule
Description	“Identifies and alerts on internal employee accounts that have been compromised, based on CYFIRMA’s threat intelligence. This rule captures the latest exposure of user credentials, IP addresses, hostnames, operating systems, and pass hashes observed in the threat feed. It supports rapid detection and investigation of phishing, stealer malware, and insider compromise scenarios.”
Severity	High
Tactics	CredentialAccess InitialAccess Persistence
Techniques	T1003 T1552 T1078 T1098
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/CompromisedEmployeesRule.yaml
Version	1.0.1
Arm template	72d3fb86-d1eb-44d6-9352-170c6bb45bb7.json

KQL

// Compromised Employees - Latest per UID
let timeFrame = 5m;
CyfirmaCompromisedAccounts_CL
| where TimeGenerated between (ago(timeFrame) .. now())
    and Category has "Compromised Employees"
| extend 
    ProviderName = 'CYFIRMA',
    ProductName = 'DeCYFIR/DeTCT'
| summarize arg_max(TimeGenerated, 
    url,
    ip,
    email,
    user_name,
    computer_name,
    operating_system,
    breach_date,
    first_seen,
    last_seen,
    impact,
    recommendations,
    description,
    source,
    pass_hash,
    ProductName,
    ProviderName
) by uid
| sort by TimeGenerated desc

YAML

queryPeriod: 5m
status: Available
incidentConfiguration:
  groupingConfiguration:
    lookbackDuration: PT5H
    reopenClosedIncident: false
    matchingMethod: AllEntities
    enabled: false
  createIncident: true
query: |
  // Compromised Employees - Latest per UID
  let timeFrame = 5m;
  CyfirmaCompromisedAccounts_CL
  | where TimeGenerated between (ago(timeFrame) .. now())
      and Category has "Compromised Employees"
  | extend 
      ProviderName = 'CYFIRMA',
      ProductName = 'DeCYFIR/DeTCT'
  | summarize arg_max(TimeGenerated, 
      url,
      ip,
      email,
      user_name,
      computer_name,
      operating_system,
      breach_date,
      first_seen,
      last_seen,
      impact,
      recommendations,
      description,
      source,
      pass_hash,
      ProductName,
      ProviderName
  ) by uid
  | sort by TimeGenerated desc  
name: CYFIRMA - Compromised Employees Detection Rule
entityMappings:
- fieldMappings:
  - columnName: user_name
    identifier: Name
  - columnName: email
    identifier: UPNSuffix
  entityType: Account
- fieldMappings:
  - columnName: computer_name
    identifier: HostName
  - columnName: operating_system
    identifier: OSVersion
  entityType: Host
- fieldMappings:
  - columnName: ip
    identifier: Address
  entityType: IP
- fieldMappings:
  - columnName: url
    identifier: Url
  entityType: URL
suppressionDuration: 6h
suppressionEnabled: true
alertDetailsOverride:
  alertDisplayNameFormat: Employee Compromised - {{user_name}} - {{email}}
  alertDescriptionFormat: '{{description}}'
  alertDynamicProperties:
  - value: ProductName
    alertProperty: ProductName
  - value: ProviderName
    alertProperty: ProviderName
description: |
  "Identifies and alerts on internal employee accounts that have been compromised, based on CYFIRMA's threat intelligence.
  This rule captures the latest exposure of user credentials, IP addresses, hostnames, operating systems, and pass hashes observed in the threat feed.
  It supports rapid detection and investigation of phishing, stealer malware, and insider compromise scenarios."  
kind: Scheduled
version: 1.0.1
eventGroupingSettings:
  aggregationKind: AlertPerResult
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Compromised Accounts/Analytic Rules/CompromisedEmployeesRule.yaml
queryFrequency: 5m
severity: High
requiredDataConnectors:
- connectorId: CyfirmaCompromisedAccountsDataConnector
  dataTypes:
  - CyfirmaCompromisedAccounts_CL
triggerOperator: gt
triggerThreshold: 0
customDetails:
  TimeGenerated: TimeGenerated
  Description: description
  UID: uid
  Impact: impact
  PassHash: pass_hash
  LastSeen: last_seen
  FirstSeen: first_seen
  Recommendations: recommendations
  Source: source
  BreachDate: breach_date
tactics:
- CredentialAccess
- InitialAccess
- Persistence
id: 72d3fb86-d1eb-44d6-9352-170c6bb45bb7
relevantTechniques:
- T1003
- T1552
- T1078
- T1098

ARM