Exchange Worker Process Making Remote Call

let suspiciousCmdLineKeywords = dynamic(["http://", "https://"]);
// Identify exchange servers based on known paths
// Summarize these to get a list of exchange server hostnames
let exchangeServers = W3CIISLog
| where csUriStem has_any("/owa/","/ews/","/ecp/","/autodiscover/")
// Only where successful, rule out failed scanning
| where scStatus startswith "2"
| summarize by Computer;
DeviceProcessEvents
| where DeviceName in~ (exchangeServers)
// Where the IIS worker process initiated CMD or PowerShell
| where InitiatingProcessParentFileName == "w3wp.exe"
| where InitiatingProcessFileName has_any("cmd.exe", "powershell.exe")
// Where CMD or PowerShell command line included parameters associated with CVE-2022-41040/CVE-2022-41082 exploitation
| where ProcessCommandLine has_any(suspiciousCmdLineKeywords)
| project TimeGenerated, DeviceId, DeviceName, InitiatingProcessFileName, ProcessCommandLine

queryFrequency: 1d
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: DeviceName
    identifier: FullName
severity: Medium
triggerThreshold: 0
relevantTechniques:
- T1059.001
- T1059.003
query: |
  let suspiciousCmdLineKeywords = dynamic(["http://", "https://"]);
  // Identify exchange servers based on known paths
  // Summarize these to get a list of exchange server hostnames
  let exchangeServers = W3CIISLog
  | where csUriStem has_any("/owa/","/ews/","/ecp/","/autodiscover/")
  // Only where successful, rule out failed scanning
  | where scStatus startswith "2"
  | summarize by Computer;
  DeviceProcessEvents
  | where DeviceName in~ (exchangeServers)
  // Where the IIS worker process initiated CMD or PowerShell
  | where InitiatingProcessParentFileName == "w3wp.exe"
  | where InitiatingProcessFileName has_any("cmd.exe", "powershell.exe")
  // Where CMD or PowerShell command line included parameters associated with CVE-2022-41040/CVE-2022-41082 exploitation
  | where ProcessCommandLine has_any(suspiciousCmdLineKeywords)
  | project TimeGenerated, DeviceId, DeviceName, InitiatingProcessFileName, ProcessCommandLine  
id: 2c701f94-783c-4cd4-bc9b-3b3334976090
triggerOperator: gt
version: 1.0.0
description: |
  'This query dynamically identifies Exchange servers and then looks for instances where the IIS worker process
  initiates a call out to a remote URL using either cmd.exe or powershell.exe. This behaviour was described as
  post-compromise behaviour following exploitation of CVE-2022-41040 and CVE-2022-41082, this pattern of activity was
  use to download additional tools to the server. This suspicious activity is generic.'  
queryPeriod: 1d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/ExchangeWorkerProcessMakingRemoteCall.yaml
requiredDataConnectors:
- connectorId: AzureMonitor(IIS)
  dataTypes:
  - W3CIISLog
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - DeviceProcessEvents
name: Exchange Worker Process Making Remote Call
tactics:
- Execution
kind: Scheduled

{
  "$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/2c701f94-783c-4cd4-bc9b-3b3334976090')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/2c701f94-783c-4cd4-bc9b-3b3334976090')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Exchange Worker Process Making Remote Call",
        "description": "'This query dynamically identifies Exchange servers and then looks for instances where the IIS worker process\ninitiates a call out to a remote URL using either cmd.exe or powershell.exe. This behaviour was described as\npost-compromise behaviour following exploitation of CVE-2022-41040 and CVE-2022-41082, this pattern of activity was\nuse to download additional tools to the server. This suspicious activity is generic.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let suspiciousCmdLineKeywords = dynamic([\"http://\", \"https://\"]);\n// Identify exchange servers based on known paths\n// Summarize these to get a list of exchange server hostnames\nlet exchangeServers = W3CIISLog\n| where csUriStem has_any(\"/owa/\",\"/ews/\",\"/ecp/\",\"/autodiscover/\")\n// Only where successful, rule out failed scanning\n| where scStatus startswith \"2\"\n| summarize by Computer;\nDeviceProcessEvents\n| where DeviceName in~ (exchangeServers)\n// Where the IIS worker process initiated CMD or PowerShell\n| where InitiatingProcessParentFileName == \"w3wp.exe\"\n| where InitiatingProcessFileName has_any(\"cmd.exe\", \"powershell.exe\")\n// Where CMD or PowerShell command line included parameters associated with CVE-2022-41040/CVE-2022-41082 exploitation\n| where ProcessCommandLine has_any(suspiciousCmdLineKeywords)\n| project TimeGenerated, DeviceId, DeviceName, InitiatingProcessFileName, ProcessCommandLine\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Execution"
        ],
        "techniques": [
          "T1059.001",
          "T1059.003"
        ],
        "alertRuleTemplateName": "2c701f94-783c-4cd4-bc9b-3b3334976090",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "DeviceName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/ExchangeWorkerProcessMakingRemoteCall.yaml",
        "templateVersion": "1.0.0"
      }
    }
  ]
}