[Deprecated] - MSHTML vulnerability CVE-2021-40444 attack

( union isfuzzy=true
(SecurityEvent
| where EventID==4688
| where isnotempty(CommandLine)
| extend FileName = Process, ProcessCommandLine = CommandLine
| where (FileName in~('control.exe','rundll32.exe') and ProcessCommandLine has '.cpl:')
  or ProcessCommandLine matches regex @'\".[a-zA-Z]{2,4}:\.\.\/\.\.'
| extend timestamp = TimeGenerated, AccountCustomEntity = Account, HostCustomEntity = Computer
),
(DeviceProcessEvents
| where (FileName in~('control.exe','rundll32.exe') and ProcessCommandLine has '.cpl:')
or ProcessCommandLine matches regex @'\".[a-zA-Z]{2,4}:\.\.\/\.\.'
| extend timestamp = TimeGenerated, AccountCustomEntity = InitiatingProcessAccountUpn, HostCustomEntity = DeviceName
),
(Event
| where Source == "Microsoft-Windows-Sysmon"
| where EventID == 1 
| extend EventData = parse_xml(EventData).DataItem.EventData.Data
| mv-expand bagexpansion=array EventData
| evaluate bag_unpack(EventData)
| extend Key = tostring(column_ifexists('@Name', "")), Value = column_ifexists('#text', "")
| evaluate pivot(Key, any(Value), TimeGenerated, Source, EventLog, Computer, EventLevel, EventLevelName, UserName, RenderedDescription, MG, ManagementGroupName, Type, _ResourceId)
| extend Image = column_ifexists("Image", ""), ProcessCommandLine = column_ifexists("CommandLine", "")
| extend FileName = split(Image, '\\', -1)[-1]
| where (FileName in~('control.exe','rundll32.exe') and ProcessCommandLine has '.cpl:')
  or ProcessCommandLine matches regex @'\".[a-zA-Z]{2,4}:\.\.\/\.\.'
| extend timestamp = TimeGenerated, AccountCustomEntity = UserName, HostCustomEntity = Computer
)
)

id: 972c89fa-c969-4d12-932f-04d55d145299
tactics:
- Execution
queryPeriod: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Legacy IOC based Threat Protection/Deprecated Analytic Rules/MSHTMLVuln.yaml
triggerThreshold: 0
name: '[Deprecated] - MSHTML vulnerability CVE-2021-40444 attack'
query: |
  ( union isfuzzy=true
  (SecurityEvent
  | where EventID==4688
  | where isnotempty(CommandLine)
  | extend FileName = Process, ProcessCommandLine = CommandLine
  | where (FileName in~('control.exe','rundll32.exe') and ProcessCommandLine has '.cpl:')
    or ProcessCommandLine matches regex @'\".[a-zA-Z]{2,4}:\.\.\/\.\.'
  | extend timestamp = TimeGenerated, AccountCustomEntity = Account, HostCustomEntity = Computer
  ),
  (DeviceProcessEvents
  | where (FileName in~('control.exe','rundll32.exe') and ProcessCommandLine has '.cpl:')
  or ProcessCommandLine matches regex @'\".[a-zA-Z]{2,4}:\.\.\/\.\.'
  | extend timestamp = TimeGenerated, AccountCustomEntity = InitiatingProcessAccountUpn, HostCustomEntity = DeviceName
  ),
  (Event
  | where Source == "Microsoft-Windows-Sysmon"
  | where EventID == 1 
  | extend EventData = parse_xml(EventData).DataItem.EventData.Data
  | mv-expand bagexpansion=array EventData
  | evaluate bag_unpack(EventData)
  | extend Key = tostring(column_ifexists('@Name', "")), Value = column_ifexists('#text', "")
  | evaluate pivot(Key, any(Value), TimeGenerated, Source, EventLog, Computer, EventLevel, EventLevelName, UserName, RenderedDescription, MG, ManagementGroupName, Type, _ResourceId)
  | extend Image = column_ifexists("Image", ""), ProcessCommandLine = column_ifexists("CommandLine", "")
  | extend FileName = split(Image, '\\', -1)[-1]
  | where (FileName in~('control.exe','rundll32.exe') and ProcessCommandLine has '.cpl:')
    or ProcessCommandLine matches regex @'\".[a-zA-Z]{2,4}:\.\.\/\.\.'
  | extend timestamp = TimeGenerated, AccountCustomEntity = UserName, HostCustomEntity = Computer
  )
  )  
severity: High
triggerOperator: gt
kind: Scheduled
relevantTechniques:
- T1203
tags:
- CVE-2021-40444
- DEV-0413
queryFrequency: 1h
requiredDataConnectors:
- connectorId: SecurityEvents
  dataTypes:
  - SecurityEvent
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - DeviceProcessEvents
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'
status: Available
version: 2.0.0
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
  entityType: Account
- fieldMappings:
  - columnName: HostCustomEntity
    identifier: FullName
  entityType: Host

{
  "$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/972c89fa-c969-4d12-932f-04d55d145299')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/972c89fa-c969-4d12-932f-04d55d145299')]",
      "properties": {
        "alertRuleTemplateName": "972c89fa-c969-4d12-932f-04d55d145299",
        "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] - MSHTML vulnerability CVE-2021-40444 attack",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "HostCustomEntity",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Legacy IOC based Threat Protection/Deprecated Analytic Rules/MSHTMLVuln.yaml",
        "query": "( union isfuzzy=true\n(SecurityEvent\n| where EventID==4688\n| where isnotempty(CommandLine)\n| extend FileName = Process, ProcessCommandLine = CommandLine\n| where (FileName in~('control.exe','rundll32.exe') and ProcessCommandLine has '.cpl:')\n  or ProcessCommandLine matches regex @'\\\".[a-zA-Z]{2,4}:\\.\\.\\/\\.\\.'\n| extend timestamp = TimeGenerated, AccountCustomEntity = Account, HostCustomEntity = Computer\n),\n(DeviceProcessEvents\n| where (FileName in~('control.exe','rundll32.exe') and ProcessCommandLine has '.cpl:')\nor ProcessCommandLine matches regex @'\\\".[a-zA-Z]{2,4}:\\.\\.\\/\\.\\.'\n| extend timestamp = TimeGenerated, AccountCustomEntity = InitiatingProcessAccountUpn, HostCustomEntity = DeviceName\n),\n(Event\n| where Source == \"Microsoft-Windows-Sysmon\"\n| where EventID == 1 \n| extend EventData = parse_xml(EventData).DataItem.EventData.Data\n| mv-expand bagexpansion=array EventData\n| evaluate bag_unpack(EventData)\n| extend Key = tostring(column_ifexists('@Name', \"\")), Value = column_ifexists('#text', \"\")\n| evaluate pivot(Key, any(Value), TimeGenerated, Source, EventLog, Computer, EventLevel, EventLevelName, UserName, RenderedDescription, MG, ManagementGroupName, Type, _ResourceId)\n| extend Image = column_ifexists(\"Image\", \"\"), ProcessCommandLine = column_ifexists(\"CommandLine\", \"\")\n| extend FileName = split(Image, '\\\\', -1)[-1]\n| where (FileName in~('control.exe','rundll32.exe') and ProcessCommandLine has '.cpl:')\n  or ProcessCommandLine matches regex @'\\\".[a-zA-Z]{2,4}:\\.\\.\\/\\.\\.'\n| extend timestamp = TimeGenerated, AccountCustomEntity = UserName, HostCustomEntity = Computer\n)\n)\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Execution"
        ],
        "tags": [
          "CVE-2021-40444",
          "DEV-0413"
        ],
        "techniques": [
          "T1203"
        ],
        "templateVersion": "2.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}