powershell - Cryptolocker 蜜 jar FileSystemWatcher

Question

我是脚本新手，所以请多多包涵。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。它只会监控最后一个共享。我看过一个similar post在这里，但对答案感到困惑。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

问题是你创建了 FileSystemWatcher循环中的实例( ForEach ($_.Path) {} )，但您将它们分配给相同的变量 $watcher ，每次都覆盖之前的引用。一旦在循环之外，您将使用 $watcher变量，它引用最后一个 FileSystemWatcher您创建的实例，这就是为什么您只收到最后一个文件的通知。

为了让它工作，你应该使用一个允许存储多个引用的类型——也就是一个数组。例子:

$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(delegate)的方法，而不是使用 WaitForChanged() 等待更改。 ，因为等待多个文件系统观察者需要并行解决方案(嗯，理想情况下)。使用 Register-ObjectEvent注册一个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 很好地包装了这一切，但我不确定 PowerShellPack 的一般状态。不过，它应该是 Windows 7/8 Resource Kit 的一部分。