勒索軟體ShrinkLocker濫用BitLocker加密電腦,導致電腦無法進入作業系統
支付動態 · 2024-05-29

研究人員揭露勒索軟體ShrinkLocker的攻擊行動,其攻擊行動的特殊之處在於,駭客不光濫用公用程式BitLocker加密磁區,還竊取金鑰導致受害電腦無法正常開機

而對於執行Windows 7以上版本的電腦,該惡意程式便會利用作業系統內建的公用程式Diskpart,將本機磁碟所有的非啟動磁區縮小100 MB,然後運用這些空間建立新的主要磁區,成功後利用另外一個公用程式bcdboot,並於新磁區部署啟動檔案,竄改電腦的機碼,調整BitLocker、TPM相關配置。

完成上述工作後,該勒索軟體便會啟動BitLocker磁碟加密服務(BDESVC),竄改磁碟機標籤留下電子郵件信箱,以便受害者能向他們聯繫。

然後,該惡意程式停用BitLocker加密金鑰保護程式,並將其刪除,防止使用者復原金鑰。接著,對方透過隨機的算數產生64個字元的加密金鑰,並將其轉換安全字串,這麼做的目的,研究人員表示,駭客是藉由PowerShell的功能,防止在記憶體內留下蹤跡。

攻擊者透過指令碼發出HTTP POST請求,回傳惡意程式產生的密碼,以及受害電腦的系統資訊,然後清除作案痕跡並將電腦關機,過程中濫用TryCloudflare服務來隱匿行蹤。

當受害者將電腦開機,會看到與BitLocker有關的訊息,然而若是嘗試執行復原,電腦會顯示沒有可復原的選項。

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