[Deprecated] - Silk Typhoon UM Service writing suspicious file

let scriptExtensions = dynamic([".php", ".jsp", ".js", ".aspx", ".asmx", ".asax", ".cfm", ".shtml"]);
union isfuzzy=true
(SecurityEvent
| where EventID == 4663
| where Process has_any ("umworkerprocess.exe", "UMService.exe")
| where ObjectName has_any (scriptExtensions)
| where AccessMask in ('0x2','0x100', '0x10', '0x4')
| extend timestamp = TimeGenerated, AccountCustomEntity = Account, HostCustomEntity = Computer, IPCustomEntity = IpAddress
),
  (WindowsEvent
| where EventID == 4663 and EventData has_any ("umworkerprocess.exe", "UMService.exe") and EventData has_any (scriptExtensions) 
| where EventData has_any ('0x2','0x100', '0x10', '0x4')
| extend NewProcessName = tostring(EventData.NewProcessName)
| extend Process=tostring(split(NewProcessName, '\\')[-1])
| where Process has_any ("umworkerprocess.exe", "UMService.exe")
| extend ObjectName = tostring(EventData.ObjectName)
| where ObjectName has_any (scriptExtensions)
| extend AccessMask = tostring(EventData.AccessMask)
| where AccessMask in ('0x2','0x100', '0x10', '0x4')
| extend Account = strcat(EventData.SubjectDomainName,"\\", EventData.SubjectUserName)
| extend IpAddress = tostring(EventData.IpAddress)
| extend timestamp = TimeGenerated, AccountCustomEntity = Account, HostCustomEntity = Computer, IPCustomEntity = IpAddress
),
(imFileEvent
| where EventType == "FileCreated"
| where ActingProcessName has_any ("umworkerprocess.exe", "UMService.exe")
  and
  TargetFileName has_any (scriptExtensions)
| extend timestamp = TimeGenerated, AccountCustomEntity = ActorUsername, HostCustomEntity = DvcHostname
),
(DeviceFileEvents
| where ActionType =~ "FileCreated"
| where InitiatingProcessFileName has_any ("umworkerprocess.exe", "UMService.exe")
| where FileName has_any(scriptExtensions)
| extend timestamp = TimeGenerated, AccountCustomEntity = InitiatingProcessAccountUpn, HostCustomEntity = DeviceName, IPCustomEntity = RequestSourceIP)

entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: InitiatingProcessAccountUpn
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
- entityType: Host
  fieldMappings:
  - identifier: FullName
    columnName: HostCustomEntity
- entityType: Host
  fieldMappings:
  - identifier: FullName
    columnName: DeviceName
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
name: '[Deprecated] - Silk Typhoon UM Service writing suspicious file'
kind: Scheduled
triggerOperator: gt
status: Available
queryPeriod: 1d
requiredDataConnectors:
- connectorId: SecurityEvents
  dataTypes:
  - SecurityEvent
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - DeviceFileEvents
- connectorId: WindowsSecurityEvents
  dataTypes:
  - SecurityEvents
- connectorId: WindowsForwardedEvents
  dataTypes:
  - WindowsEvent
tactics:
- InitialAccess
query: |
  let scriptExtensions = dynamic([".php", ".jsp", ".js", ".aspx", ".asmx", ".asax", ".cfm", ".shtml"]);
  union isfuzzy=true
  (SecurityEvent
  | where EventID == 4663
  | where Process has_any ("umworkerprocess.exe", "UMService.exe")
  | where ObjectName has_any (scriptExtensions)
  | where AccessMask in ('0x2','0x100', '0x10', '0x4')
  | extend timestamp = TimeGenerated, AccountCustomEntity = Account, HostCustomEntity = Computer, IPCustomEntity = IpAddress
  ),
    (WindowsEvent
  | where EventID == 4663 and EventData has_any ("umworkerprocess.exe", "UMService.exe") and EventData has_any (scriptExtensions) 
  | where EventData has_any ('0x2','0x100', '0x10', '0x4')
  | extend NewProcessName = tostring(EventData.NewProcessName)
  | extend Process=tostring(split(NewProcessName, '\\')[-1])
  | where Process has_any ("umworkerprocess.exe", "UMService.exe")
  | extend ObjectName = tostring(EventData.ObjectName)
  | where ObjectName has_any (scriptExtensions)
  | extend AccessMask = tostring(EventData.AccessMask)
  | where AccessMask in ('0x2','0x100', '0x10', '0x4')
  | extend Account = strcat(EventData.SubjectDomainName,"\\", EventData.SubjectUserName)
  | extend IpAddress = tostring(EventData.IpAddress)
  | extend timestamp = TimeGenerated, AccountCustomEntity = Account, HostCustomEntity = Computer, IPCustomEntity = IpAddress
  ),
  (imFileEvent
  | where EventType == "FileCreated"
  | where ActingProcessName has_any ("umworkerprocess.exe", "UMService.exe")
    and
    TargetFileName has_any (scriptExtensions)
  | extend timestamp = TimeGenerated, AccountCustomEntity = ActorUsername, HostCustomEntity = DvcHostname
  ),
  (DeviceFileEvents
  | where ActionType =~ "FileCreated"
  | where InitiatingProcessFileName has_any ("umworkerprocess.exe", "UMService.exe")
  | where FileName has_any(scriptExtensions)
  | extend timestamp = TimeGenerated, AccountCustomEntity = InitiatingProcessAccountUpn, HostCustomEntity = DeviceName, IPCustomEntity = RequestSourceIP)
description: |
  'This query has been deprecated as the associated IoCs (Indicators of Compromise) are outdated and no longer relevant. To ensure effective threat detection, it is recommended to implement Microsoft's Threat Intelligence solution, which enables matching your log data with the most up-to-date IoCs generated by Microsoft. This solution can be installed from the Microsoft Sentinel Content Hub if not currently deployed. More details on the Content Hub can be found here: https://learn.microsoft.com/azure/sentinel/sentinel-solutions-deploy'
severity: High
tags:
- Schema: ASIMFileEvent
  SchemaVersion: 0.1.0
id: 7d6d8a8e-b08a-4082-8dbb-d7fd2cbbc35e
triggerThreshold: 0
queryFrequency: 1d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Legacy%20IOC%20based%20Threat%20Protection/Deprecated%20Analytic%20Rules/SilkTyphoonUmServiceSuspiciousFile.yaml
version: 2.0.0
relevantTechniques:
- T1190

{
  "$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/7d6d8a8e-b08a-4082-8dbb-d7fd2cbbc35e')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/7d6d8a8e-b08a-4082-8dbb-d7fd2cbbc35e')]",
      "properties": {
        "alertRuleTemplateName": "7d6d8a8e-b08a-4082-8dbb-d7fd2cbbc35e",
        "customDetails": null,
        "description": "'This query has been deprecated as the associated IoCs (Indicators of Compromise) are outdated and no longer relevant. To ensure effective threat detection, it is recommended to implement Microsoft's Threat Intelligence solution, which enables matching your log data with the most up-to-date IoCs generated by Microsoft. This solution can be installed from the Microsoft Sentinel Content Hub if not currently deployed. More details on the Content Hub can be found here: https://learn.microsoft.com/azure/sentinel/sentinel-solutions-deploy'\n",
        "displayName": "[Deprecated] - Silk Typhoon UM Service writing suspicious file",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "InitiatingProcessAccountUpn",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "HostCustomEntity",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "DeviceName",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Legacy%20IOC%20based%20Threat%20Protection/Deprecated%20Analytic%20Rules/SilkTyphoonUmServiceSuspiciousFile.yaml",
        "query": "let scriptExtensions = dynamic([\".php\", \".jsp\", \".js\", \".aspx\", \".asmx\", \".asax\", \".cfm\", \".shtml\"]);\nunion isfuzzy=true\n(SecurityEvent\n| where EventID == 4663\n| where Process has_any (\"umworkerprocess.exe\", \"UMService.exe\")\n| where ObjectName has_any (scriptExtensions)\n| where AccessMask in ('0x2','0x100', '0x10', '0x4')\n| extend timestamp = TimeGenerated, AccountCustomEntity = Account, HostCustomEntity = Computer, IPCustomEntity = IpAddress\n),\n  (WindowsEvent\n| where EventID == 4663 and EventData has_any (\"umworkerprocess.exe\", \"UMService.exe\") and EventData has_any (scriptExtensions) \n| where EventData has_any ('0x2','0x100', '0x10', '0x4')\n| extend NewProcessName = tostring(EventData.NewProcessName)\n| extend Process=tostring(split(NewProcessName, '\\\\')[-1])\n| where Process has_any (\"umworkerprocess.exe\", \"UMService.exe\")\n| extend ObjectName = tostring(EventData.ObjectName)\n| where ObjectName has_any (scriptExtensions)\n| extend AccessMask = tostring(EventData.AccessMask)\n| where AccessMask in ('0x2','0x100', '0x10', '0x4')\n| extend Account = strcat(EventData.SubjectDomainName,\"\\\\\", EventData.SubjectUserName)\n| extend IpAddress = tostring(EventData.IpAddress)\n| extend timestamp = TimeGenerated, AccountCustomEntity = Account, HostCustomEntity = Computer, IPCustomEntity = IpAddress\n),\n(imFileEvent\n| where EventType == \"FileCreated\"\n| where ActingProcessName has_any (\"umworkerprocess.exe\", \"UMService.exe\")\n  and\n  TargetFileName has_any (scriptExtensions)\n| extend timestamp = TimeGenerated, AccountCustomEntity = ActorUsername, HostCustomEntity = DvcHostname\n),\n(DeviceFileEvents\n| where ActionType =~ \"FileCreated\"\n| where InitiatingProcessFileName has_any (\"umworkerprocess.exe\", \"UMService.exe\")\n| where FileName has_any(scriptExtensions)\n| extend timestamp = TimeGenerated, AccountCustomEntity = InitiatingProcessAccountUpn, HostCustomEntity = DeviceName, IPCustomEntity = RequestSourceIP)\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "tags": [
          {
            "Schema": "ASIMFileEvent",
            "SchemaVersion": "0.1.0"
          }
        ],
        "techniques": [
          "T1190"
        ],
        "templateVersion": "2.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}