HAFNIUM New UM Service Child Process

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Id	95a15f39-d9cc-4667-8cdd-58f3113691c9
Rulename	HAFNIUM New UM Service Child Process
Description	This query looks for new processes being spawned by the Exchange UM service where that process has not previously been observed before. Reference: https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/
Severity	Medium
Tactics	InitialAccess
Techniques	T1190
Required data connectors	SecurityEvents WindowsForwardedEvents WindowsSecurityEvents
Kind	Scheduled
Query frequency	1d
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/HAFNIUMNewUMServiceChildProcess.yaml
Version	1.1.2
Arm template	95a15f39-d9cc-4667-8cdd-58f3113691c9.json

KQL

let lookback = 14d;
let timeframe = 1d;
(union isfuzzy=true
(SecurityEvent
| where TimeGenerated > ago(lookback) and TimeGenerated < ago(timeframe)
| where EventID == 4688
| where ParentProcessName has_any ("umworkerprocess.exe", "UMService.exe")
| join kind=rightanti (
SecurityEvent
| where TimeGenerated > ago(timeframe)
| where ParentProcessName has_any ("umworkerprocess.exe", "UMService.exe")
| where EventID == 4688) on NewProcessName
| extend timestamp = TimeGenerated, AccountCustomEntity = Account, HostCustomEntity = Computer, IPCustomEntity = IpAddress
),
(WindowsEvent
| where TimeGenerated > ago(lookback) and TimeGenerated < ago(timeframe)
| where EventID == 4688 and EventData has_any ("umworkerprocess.exe", "UMService.exe")
| extend ParentProcessName = tostring(EventData.ParentProcessName)
| where ParentProcessName has_any ("umworkerprocess.exe", "UMService.exe")
| extend NewProcessName = tostring(EventData.NewProcessName)
| extend Account = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
| extend IpAddress = tostring(EventData.IpAddress)
| join kind=rightanti (
WindowsEvent
| where TimeGenerated > ago(timeframe)
| where EventID == 4688  and EventData has_any ("umworkerprocess.exe", "UMService.exe")
| extend ParentProcessName = tostring(EventData.ParentProcessName)
| where ParentProcessName has_any ("umworkerprocess.exe", "UMService.exe")
| extend NewProcessName = tostring(EventData.NewProcessName)
| extend Account = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
| extend IpAddress = tostring(EventData.IpAddress)) on NewProcessName
| extend timestamp = TimeGenerated, AccountCustomEntity = Account, HostCustomEntity = Computer, IPCustomEntity = IpAddress
))

YAML

name: HAFNIUM New UM Service Child Process
query: |
  let lookback = 14d;
  let timeframe = 1d;
  (union isfuzzy=true
  (SecurityEvent
  | where TimeGenerated > ago(lookback) and TimeGenerated < ago(timeframe)
  | where EventID == 4688
  | where ParentProcessName has_any ("umworkerprocess.exe", "UMService.exe")
  | join kind=rightanti (
  SecurityEvent
  | where TimeGenerated > ago(timeframe)
  | where ParentProcessName has_any ("umworkerprocess.exe", "UMService.exe")
  | where EventID == 4688) on NewProcessName
  | extend timestamp = TimeGenerated, AccountCustomEntity = Account, HostCustomEntity = Computer, IPCustomEntity = IpAddress
  ),
  (WindowsEvent
  | where TimeGenerated > ago(lookback) and TimeGenerated < ago(timeframe)
  | where EventID == 4688 and EventData has_any ("umworkerprocess.exe", "UMService.exe")
  | extend ParentProcessName = tostring(EventData.ParentProcessName)
  | where ParentProcessName has_any ("umworkerprocess.exe", "UMService.exe")
  | extend NewProcessName = tostring(EventData.NewProcessName)
  | extend Account = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
  | extend IpAddress = tostring(EventData.IpAddress)
  | join kind=rightanti (
  WindowsEvent
  | where TimeGenerated > ago(timeframe)
  | where EventID == 4688  and EventData has_any ("umworkerprocess.exe", "UMService.exe")
  | extend ParentProcessName = tostring(EventData.ParentProcessName)
  | where ParentProcessName has_any ("umworkerprocess.exe", "UMService.exe")
  | extend NewProcessName = tostring(EventData.NewProcessName)
  | extend Account = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
  | extend IpAddress = tostring(EventData.IpAddress)) on NewProcessName
  | extend timestamp = TimeGenerated, AccountCustomEntity = Account, HostCustomEntity = Computer, IPCustomEntity = IpAddress
  ))    
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/HAFNIUMNewUMServiceChildProcess.yaml
queryFrequency: 1d
triggerThreshold: 0
requiredDataConnectors:
- dataTypes:
  - SecurityEvent
  connectorId: SecurityEvents
- dataTypes:
  - SecurityEvent
  connectorId: WindowsSecurityEvents
- dataTypes:
  - SecurityEvents
  connectorId: WindowsSecurityEvents
- dataTypes:
  - WindowsEvent
  connectorId: WindowsForwardedEvents
version: 1.1.2
queryPeriod: 14d
id: 95a15f39-d9cc-4667-8cdd-58f3113691c9
triggerOperator: gt
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
  entityType: Account
- fieldMappings:
  - identifier: FullName
    columnName: HostCustomEntity
  entityType: Host
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
metadata:
  source:
    kind: Community
  author:
    name: Pete Bryan
  categories:
    domains:
    - Security - Threat Intelligence
  support:
    tier: Community
relevantTechniques:
- T1190
severity: Medium
description: |
  'This query looks for new processes being spawned by the Exchange UM service where that process has not previously been observed before. 
  Reference: https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/'  
kind: Scheduled
tactics:
- InitialAccess

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/95a15f39-d9cc-4667-8cdd-58f3113691c9')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/95a15f39-d9cc-4667-8cdd-58f3113691c9')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "HAFNIUM New UM Service Child Process",
        "description": "'This query looks for new processes being spawned by the Exchange UM service where that process has not previously been observed before. \nReference: https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let lookback = 14d;\nlet timeframe = 1d;\n(union isfuzzy=true\n(SecurityEvent\n| where TimeGenerated > ago(lookback) and TimeGenerated < ago(timeframe)\n| where EventID == 4688\n| where ParentProcessName has_any (\"umworkerprocess.exe\", \"UMService.exe\")\n| join kind=rightanti (\nSecurityEvent\n| where TimeGenerated > ago(timeframe)\n| where ParentProcessName has_any (\"umworkerprocess.exe\", \"UMService.exe\")\n| where EventID == 4688) on NewProcessName\n| extend timestamp = TimeGenerated, AccountCustomEntity = Account, HostCustomEntity = Computer, IPCustomEntity = IpAddress\n),\n(WindowsEvent\n| where TimeGenerated > ago(lookback) and TimeGenerated < ago(timeframe)\n| where EventID == 4688 and EventData has_any (\"umworkerprocess.exe\", \"UMService.exe\")\n| extend ParentProcessName = tostring(EventData.ParentProcessName)\n| where ParentProcessName has_any (\"umworkerprocess.exe\", \"UMService.exe\")\n| extend NewProcessName = tostring(EventData.NewProcessName)\n| extend Account = strcat(tostring(EventData.SubjectDomainName),\"\\\\\", tostring(EventData.SubjectUserName))\n| extend IpAddress = tostring(EventData.IpAddress)\n| join kind=rightanti (\nWindowsEvent\n| where TimeGenerated > ago(timeframe)\n| where EventID == 4688  and EventData has_any (\"umworkerprocess.exe\", \"UMService.exe\")\n| extend ParentProcessName = tostring(EventData.ParentProcessName)\n| where ParentProcessName has_any (\"umworkerprocess.exe\", \"UMService.exe\")\n| extend NewProcessName = tostring(EventData.NewProcessName)\n| extend Account = strcat(tostring(EventData.SubjectDomainName),\"\\\\\", tostring(EventData.SubjectUserName))\n| extend IpAddress = tostring(EventData.IpAddress)) on NewProcessName\n| extend timestamp = TimeGenerated, AccountCustomEntity = Account, HostCustomEntity = Computer, IPCustomEntity = IpAddress\n))  \n",
        "queryFrequency": "P1D",
        "queryPeriod": "P14D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1190"
        ],
        "alertRuleTemplateName": "95a15f39-d9cc-4667-8cdd-58f3113691c9",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AccountCustomEntity"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "HostCustomEntity"
              }
            ],
            "entityType": "Host"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ],
            "entityType": "IP"
          }
        ],
        "templateVersion": "1.1.2",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SecurityEvent/HAFNIUMNewUMServiceChildProcess.yaml"
      }
    }
  ]
}