Remote Desktop Protocol - SharpRDP

let executions = DeviceProcessEvents
| where InitiatingProcessFileName contains "taskmgr" and AccountName !contains "_ladm" // Include your LAPS /RID500 admin naming convention here. 
// Add the below filter to look for stock SharpRDP behavior. However, with minorchanges to the stock version of SharpRDP the filter below can be bypassed.
//| where not(InitiatingProcessCommandLine has_any ("/1","/2","/3","/4"))
| where not(FolderPath =~ @"c:\Windows\system32\WerFault.exe" and ProcessCommandLine contains "-u -p")
| where not(FolderPath =~ @"c:\windows\system32\mmc.exe" and ProcessCommandLine contains @"C:\WINDOWS\System32\services.msc")
| where not(FolderPath =~ @"c:\windows\system32\resmon.exe");
executions
| join kind=leftsemi  (DeviceLogonEvents
| where LogonType in ('Unlock', 'RemoteInteractive') and not (LogonType == 'Unlock' and RemoteIP == '127.0.0.1') and RemoteIP != "" and ActionType == "LogonSuccess") on DeviceId, LogonId

relevantTechniques:
- T1021.001
name: Remote Desktop Protocol - SharpRDP
requiredDataConnectors:
- dataTypes:
  - DeviceProcessEvents
  - DeviceLogonEvents
  connectorId: MicrosoftThreatProtection
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: DeviceName
  entityType: Host
- fieldMappings:
  - identifier: Sid
    columnName: AccountSid
  - identifier: Name
    columnName: AccountName
  - identifier: NTDomain
    columnName: AccountDomain
  entityType: Account
- fieldMappings:
  - identifier: CommandLine
    columnName: ProcessCommandLine
  entityType: Process
triggerThreshold: 0
id: cc46e76c-0d04-40b0-9c8b-929aa40513e7
tactics:
- LateralMovement
version: 1.0.0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic Rules/RemoteDesktopProtocol.yaml
queryPeriod: 1h
kind: Scheduled
queryFrequency: 1h
severity: Medium
status: Available
description: |
    This detection monitors for the behavior that SharpRDP exhibits on the target system. The most relevant is leveraging taskmgr.exe to gain elevated execution, which means that taskmgr.exe is creating unexpected child processes.
query: |
  let executions = DeviceProcessEvents
  | where InitiatingProcessFileName contains "taskmgr" and AccountName !contains "_ladm" // Include your LAPS /RID500 admin naming convention here. 
  // Add the below filter to look for stock SharpRDP behavior. However, with minorchanges to the stock version of SharpRDP the filter below can be bypassed.
  //| where not(InitiatingProcessCommandLine has_any ("/1","/2","/3","/4"))
  | where not(FolderPath =~ @"c:\Windows\system32\WerFault.exe" and ProcessCommandLine contains "-u -p")
  | where not(FolderPath =~ @"c:\windows\system32\mmc.exe" and ProcessCommandLine contains @"C:\WINDOWS\System32\services.msc")
  | where not(FolderPath =~ @"c:\windows\system32\resmon.exe");
  executions
  | join kind=leftsemi  (DeviceLogonEvents
  | where LogonType in ('Unlock', 'RemoteInteractive') and not (LogonType == 'Unlock' and RemoteIP == '127.0.0.1') and RemoteIP != "" and ActionType == "LogonSuccess") on DeviceId, LogonId  
triggerOperator: gt

{
  "$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/cc46e76c-0d04-40b0-9c8b-929aa40513e7')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/cc46e76c-0d04-40b0-9c8b-929aa40513e7')]",
      "properties": {
        "alertRuleTemplateName": "cc46e76c-0d04-40b0-9c8b-929aa40513e7",
        "customDetails": null,
        "description": "This detection monitors for the behavior that SharpRDP exhibits on the target system. The most relevant is leveraging taskmgr.exe to gain elevated execution, which means that taskmgr.exe is creating unexpected child processes.\n",
        "displayName": "Remote Desktop Protocol - SharpRDP",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "DeviceName",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountSid",
                "identifier": "Sid"
              },
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountDomain",
                "identifier": "NTDomain"
              }
            ]
          },
          {
            "entityType": "Process",
            "fieldMappings": [
              {
                "columnName": "ProcessCommandLine",
                "identifier": "CommandLine"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic Rules/RemoteDesktopProtocol.yaml",
        "query": "let executions = DeviceProcessEvents\n| where InitiatingProcessFileName contains \"taskmgr\" and AccountName !contains \"_ladm\" // Include your LAPS /RID500 admin naming convention here. \n// Add the below filter to look for stock SharpRDP behavior. However, with minorchanges to the stock version of SharpRDP the filter below can be bypassed.\n//| where not(InitiatingProcessCommandLine has_any (\"/1\",\"/2\",\"/3\",\"/4\"))\n| where not(FolderPath =~ @\"c:\\Windows\\system32\\WerFault.exe\" and ProcessCommandLine contains \"-u -p\")\n| where not(FolderPath =~ @\"c:\\windows\\system32\\mmc.exe\" and ProcessCommandLine contains @\"C:\\WINDOWS\\System32\\services.msc\")\n| where not(FolderPath =~ @\"c:\\windows\\system32\\resmon.exe\");\nexecutions\n| join kind=leftsemi  (DeviceLogonEvents\n| where LogonType in ('Unlock', 'RemoteInteractive') and not (LogonType == 'Unlock' and RemoteIP == '127.0.0.1') and RemoteIP != \"\" and ActionType == \"LogonSuccess\") on DeviceId, LogonId\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [
          "T1021.001"
        ],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "LateralMovement"
        ],
        "techniques": [
          "T1021"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}