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

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.
version: 1.0.0
tactics:
- LateralMovement
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
queryFrequency: 1h
triggerThreshold: 0
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
status: Available
relevantTechniques:
- T1021.001
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic Rules/RemoteDesktopProtocol.yaml
queryPeriod: 1h
id: cc46e76c-0d04-40b0-9c8b-929aa40513e7
name: Remote Desktop Protocol - SharpRDP
kind: Scheduled
requiredDataConnectors:
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - DeviceProcessEvents
  - DeviceLogonEvents
severity: Medium

{
  "$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"
    }
  ]
}