CYFIRMA - Compromised Employees Detection Rule | Microsoft Sentinel Analytic Rules

Back


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%20Compromised%20Accounts/Analytic%20Rules/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

incidentConfiguration:
  groupingConfiguration:
    matchingMethod: AllEntities
    enabled: false
    lookbackDuration: PT5H
    reopenClosedIncident: false
  createIncident: true
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma%20Compromised%20Accounts/Analytic%20Rules/CompromisedEmployeesRule.yaml
triggerThreshold: 0
id: 72d3fb86-d1eb-44d6-9352-170c6bb45bb7
suppressionEnabled: true
kind: Scheduled
queryPeriod: 5m
eventGroupingSettings:
  aggregationKind: AlertPerResult
tactics:
- CredentialAccess
- InitialAccess
- Persistence
queryFrequency: 5m
alertDetailsOverride:
  alertDescriptionFormat: '{{description}}'
  alertDisplayNameFormat: Employee Compromised - {{user_name}} - {{email}}
  alertDynamicProperties:
  - alertProperty: ProductName
    value: ProductName
  - alertProperty: ProviderName
    value: ProviderName
severity: High
name: CYFIRMA - Compromised Employees Detection Rule
customDetails:
  Description: description
  Recommendations: recommendations
  LastSeen: last_seen
  TimeGenerated: TimeGenerated
  BreachDate: breach_date
  Source: source
  PassHash: pass_hash
  UID: uid
  Impact: impact
  FirstSeen: first_seen
requiredDataConnectors:
- connectorId: CyfirmaCompromisedAccountsDataConnector
  dataTypes:
  - CyfirmaCompromisedAccounts_CL
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
version: 1.0.1
relevantTechniques:
- T1003
- T1552
- T1078
- T1098
status: Available
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
suppressionDuration: 6h
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."

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/72d3fb86-d1eb-44d6-9352-170c6bb45bb7')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/72d3fb86-d1eb-44d6-9352-170c6bb45bb7')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "{{description}}",
          "alertDisplayNameFormat": "Employee Compromised - {{user_name}} - {{email}}",
          "alertDynamicProperties": [
            {
              "alertProperty": "ProductName",
              "value": "ProductName"
            },
            {
              "alertProperty": "ProviderName",
              "value": "ProviderName"
            }
          ]
        },
        "alertRuleTemplateName": "72d3fb86-d1eb-44d6-9352-170c6bb45bb7",
        "customDetails": {
          "BreachDate": "breach_date",
          "Description": "description",
          "FirstSeen": "first_seen",
          "Impact": "impact",
          "LastSeen": "last_seen",
          "PassHash": "pass_hash",
          "Recommendations": "recommendations",
          "Source": "source",
          "TimeGenerated": "TimeGenerated",
          "UID": "uid"
        },
        "description": "\"Identifies and alerts on internal employee accounts that have been compromised, based on CYFIRMA's threat intelligence.\nThis rule captures the latest exposure of user credentials, IP addresses, hostnames, operating systems, and pass hashes observed in the threat feed.\nIt supports rapid detection and investigation of phishing, stealer malware, and insider compromise scenarios.\"\n",
        "displayName": "CYFIRMA - Compromised Employees Detection Rule",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "user_name",
                "identifier": "Name"
              },
              {
                "columnName": "email",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "computer_name",
                "identifier": "HostName"
              },
              {
                "columnName": "operating_system",
                "identifier": "OSVersion"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "ip",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "url",
                "identifier": "Url"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": false,
            "lookbackDuration": "PT5H",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma%20Compromised%20Accounts/Analytic%20Rules/CompromisedEmployeesRule.yaml",
        "query": "// Compromised Employees - Latest per UID\nlet timeFrame = 5m;\nCyfirmaCompromisedAccounts_CL\n| where TimeGenerated between (ago(timeFrame) .. now())\n    and Category has \"Compromised Employees\"\n| extend \n    ProviderName = 'CYFIRMA',\n    ProductName = 'DeCYFIR/DeTCT'\n| summarize arg_max(TimeGenerated, \n    url,\n    ip,\n    email,\n    user_name,\n    computer_name,\n    operating_system,\n    breach_date,\n    first_seen,\n    last_seen,\n    impact,\n    recommendations,\n    description,\n    source,\n    pass_hash,\n    ProductName,\n    ProviderName\n) by uid\n| sort by TimeGenerated desc\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT6H",
        "suppressionEnabled": true,
        "tactics": [
          "CredentialAccess",
          "InitialAccess",
          "Persistence"
        ],
        "techniques": [
          "T1003",
          "T1078",
          "T1098",
          "T1552"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}