OMGData - Using Odata for C2 basic construct.

README.md

Create an Odata listener,

Then se how to fetch it with DataSVCUtil

Run you listener

Fetch

C:\Windows\Microsoft.NET\Framework\v4.0.30319\DataSvcUtil.exe /uri:http://localhost:8080/odata /out:HelloODataClient.cs /Version:1.0

Odata.ps1

# HelloOData.ps1 - Minimal OData Service
$url = "http://localhost:8080/"

$listener = New-Object System.Net.HttpListener
$listener.Prefixes.Add($url)
$listener.Start()

Write-Host "OData service running at $url"
Write-Host "Try: ${url}odata/`$metadata"
Write-Host "Try: ${url}odata/Messages"
Write-Host "Press Ctrl+C to stop"

try {
    while ($listener.IsListening) {
        $context = $listener.GetContext()
        $request = $context.Request
        $response = $context.Response
        
        $path = $request.Url.AbsolutePath
        Write-Host "Request: $path"
        
        if ($path -eq "/odata/`$metadata") {
            # OData Metadata
            $metadata = @"
<?xml version="1.0" encoding="utf-8"?>
<edmx:Edmx Version="1.0" xmlns:edmx="http://schemas.microsoft.com/ado/2007/06/edmx">
  <edmx:DataServices m:DataServiceVersion="2.0" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
    <Schema Namespace="HelloOData" xmlns="http://schemas.microsoft.com/ado/2008/09/edm">
      <EntityType Name="Message">
        <Key>
          <PropertyRef Name="Id" />
        </Key>
        <Property Name="Id" Type="Edm.Int32" Nullable="false" />
        <Property Name="Text" Type="Edm.String" />
        <Property Name="Timestamp" Type="Edm.DateTime" />
      </EntityType>
      <EntityContainer Name="HelloODataContext" m:IsDefaultEntityContainer="true">
        <EntitySet Name="Messages" EntityType="HelloOData.Message" />
      </EntityContainer>
    </Schema>
  </edmx:DataServices>
</edmx:Edmx>
"@
            $buffer = [System.Text.Encoding]::UTF8.GetBytes($metadata)
            $response.ContentType = "application/xml"
            $response.ContentLength64 = $buffer.Length
            $response.OutputStream.Write($buffer, 0, $buffer.Length)
        }
        elseif ($path -eq "/odata/Messages") {
            # Sample data
            $data = @"
{
  "value": [
    {
      "Id": 1,
      "Text": "Hello from OData!",
      "Timestamp": "2024-12-09T10:00:00Z"
    },
    {
      "Id": 2,
      "Text": "Build system test",
      "Timestamp": "2024-12-09T11:00:00Z"
    }
  ]
}
"@
            $buffer = [System.Text.Encoding]::UTF8.GetBytes($data)
            $response.ContentType = "application/json"
            $response.ContentLength64 = $buffer.Length
            $response.OutputStream.Write($buffer, 0, $buffer.Length)
        }
        else {
            # 404
            $response.StatusCode = 404
            $buffer = [System.Text.Encoding]::UTF8.GetBytes("Not Found")
            $response.OutputStream.Write($buffer, 0, $buffer.Length)
        }
        
        $response.Close()
    }
}
finally {
    $listener.Stop()
    Write-Host "`nService stopped"
}