Question

在编写脚本时我是新手所以请耐心等待。我正在尝试创建一个脚本来监视添加到服务器上所有文件共享的诱饵文件。当脚本看到文件被修改时，它将阻止对进行修改的用户的访问并发送电子邮件。除了FileSystemWatcher之外，该脚本似乎工作正常。它只会监控最后一次分享。我在这里看到similar post，但却对答案感到困惑。有人可以帮我完成为每个诱饵文件创建FileSystemWatcher的任务吗？我还想了解如何以其他方式改进脚本。非常感谢您的帮助。

$to = "joe@blow.com"
$File = "test.txt" 
$FilePath = "C:\temp"
$md5 = new-object -TypeName System.Security.Cryptography.MD5CryptoServiceProvider

## SEND MAIL FUNCTION
function sendMail($s, $to) {
    $smtpServer = "mail.nowhere.com"
    $smtpFrom = "alert@nowhere.com"
    $smtpTo = $to

    $messageSubject = $s[0]
    $message = New-Object System.Net.Mail.MailMessage $smtpfrom, $smtpto
    $message.Subject = $messageSubject
    $message.IsBodyHTML = $false
    $message.Body = $s[1]

    $smtp = New-Object Net.Mail.SmtpClient($smtpServer)
    $smtp.Send($message)
}

## Get a list of shares and Perform tasks on each location.
$cryptopaths = Get-WmiObject -Class win32_share -filter "Type=0 AND name like '%[^$]'" | ForEach ($_.Path) {
    $cryptopath = $_.Path

    ## Copy the bait file to the share location
    Copy $FilePath\$File $cryptopath\$File -Force

    ##Get files hash
    Try {
        $Origin = [System.BitConverter]::ToString($md5.ComputeHash([System.IO.File]::ReadAllBytes("$FilePath\$File")))
        $Copy = [System.BitConverter]::ToString($md5.ComputeHash([System.IO.File]::ReadAllBytes("$CryptoPath\$File")))

    }
     ##Error on reading hash
        Catch {
            echo "error reading $CryptoPath\$File" 
        }

    ## If files don't match, then Send messaged and quit
    if (Compare-Object $Origin $Copy){
        ## files don't match
        $subject = "Error logged on $CryptoPath\$File by $env:username on $env:computername"
        $body = "The original file does not match the witness file.  Aborting monitor script."
        $email =@($subject,$body)
        sendMail -s $email -to "ben22@nowhere.com"
        Exit
        }




    ## CREATE WATCHER ON DIRECTORY
    $watcher = New-Object System.IO.FileSystemWatcher
    $watcher.Path = $CryptoPath
    $watcher.Filter = $File
    $watcher.IncludeSubdirectories = $false
    $watcher.EnableRaisingEvents = $false
    $watcher.NotifyFilter = [System.IO.NotifyFilters]::LastWrite -bor [System.IO.NotifyFilters]::FileName
}


## Execute Watcher
while($TRUE){
    $result = $watcher.WaitForChanged([System.IO.WatcherChangeTypes]::Changed `
        -bor [System.IO.WatcherChangeTypes]::Renamed `
        -bor [System.IO.WatcherChangeTypes]::Deleted `
        -bor [System.IO.WatcherChangeTypes]::Created, 1000);
    if ($result.TimedOut){
        continue;
    }

    if ($result.Name -eq $File) {
        ### Make sure the files do not match
        try {
            $FileCheck = [System.BitConverter]::ToString($md5.ComputeHash([System.IO.File]::ReadAllBytes("$CryptoPath\$File")))
            if (Compare-Object $Origin $FileCheck){
                ## files don't match
                $body = "Witness file $FilePath\$File on $env:computername has been modified."
                }
        }
        catch {
            ## file deleted
            $body = "Witness file $FilePath\$File on $env:computername has been deleted"
            }
        finally {
            ## Deny owner of changed file access to shares and disconnect their open sessions. Send email alert
            Get-Acl "$CryptoPath\$File" | foreach ($_.Owner) {
            Get-SmbShare | Block-SmbShareAccess –AccountName $_.Owner
            Close-SmbSession –ClientUserName $_.Owner
            }
            $subject = "EMERGENCY ON FILE SERVER -- $FilePath\$File by $env:username on $env:computername"
            $email =@($subject,$body)
            sendMail -s $email -to "ben22@nowhere.com"
            sendMail -s $email -to "5555555555@txt.bell.ca"
            Exit

        }

    }

}

Answer 1

问题是您在循环（FileSystemWatcher）中创建ForEach ($_.Path) {}个实例，但是您将它们分配给同一个变量$watcher，每次都覆盖以前的引用。在循环之外，您使用$watcher变量，该变量引用您创建的 last FileSystemWatcher实例，以及您接收上一个文件的通知的原因仅

要使其正常工作，您应该使用允许存储多个引用的类型 - 即数组。例如：

$watchers = @();
...
$watcher = New-Object System.IO.FileSystemWatcher;
...
$watchers += $watcher;

另外，我建议使用基于事件处理程序/回调/委托的方法，而不是等待使用WaitForChanged()进行更改，因为等待多个文件系统观察者会要求并行化解决方案（理想情况下）。使用Register-ObjectEvent注册事件处理程序并特别查看此示例：http://gallery.technet.microsoft.com/scriptcenter/Powershell-FileSystemWatche-dfd7084b。

PowerShellPack还有一个Start-FileSystemWatcher cmdlet可以很好地包装这一点，但我一般都不确定PowerShellPack的状态。但它应该是Windows 7/8 Resource Kit的一部分。

Cryptolocker Honeypot FileSystemWatcher

1 个答案: