powershell - Cryptolocker Honeypot FileSystemWatcher

我是脚本的新手，请耐心等待。我正在尝试创建一个脚本，该脚本将监视添加到服务器上所有文件共享的诱饵文件。当脚本看到文件已被修改时，它将阻止对进行了修改的用户的访问并发送电子邮件。除了FileSystemWatcher之外，该脚本似乎可以正常运行。它将仅监视最后一个共享。我在这里看到了similar post，但对答案感到困惑。有人可以帮我为每个诱饵文件创建FileSystemWatcher的任务吗？我也希望获得关于如何以其他方式改进脚本的任何意见。非常感谢您的帮助。

$to = "[email protected]"
$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 = "[email protected]"
    $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 "[email protected]"
        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 "[email protected]"
            sendMail -s $email -to "[email protected]"
            Exit

        }

    }

}

最佳答案

问题是您在循环(FileSystemWatcher)中创建ForEach ($_.Path) {}实例，但是将它们分配给相同的变量$watcher，每次都覆盖先前的引用。一旦进入循环，您就可以使用$watcher变量，该变量引用您创建的最后一个FileSystemWatcher实例，这就是为什么仅接收最后一个文件的通知的原因。

为了使此工作正常进行，您应该使用允许存储多个引用的类型-即数组。例:

$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，而不是等待使用WaitForChanged()进行更改，因为等待多个文件系统观察者将需要并行解决方案(理想情况下)。使用Register-ObjectEvent注册事件处理程序，尤其是该示例:http://gallery.technet.microsoft.com/scriptcenter/Powershell-FileSystemWatche-dfd7084b。

PowerShellPack也有一个Start-FileSystemWatcher cmdlet，可以很好地包装所有内容，但是我不确定PowerShellPack的总体状态。但是，它应该是Windows 7/8 Resource Kit的一部分。

关于powershell - Cryptolocker Honeypot FileSystemWatcher，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/24794117/