網路釣魚攻擊鎖定OneDrive用戶,引誘執行惡意PowerShell指令碼
支付動態 · 2024-08-01

研究人員發現聲稱雲端檔案共享服務OneDrive故障的攻擊行動,駭客假借使用者必須手動排除為由,要求依照指示複製、執行PowerShell命令

而這個錯誤訊息提供使用者兩個按鈕,其中一個是修復方法(How to fix),另一個則是詳細資料。

若是點選詳細資料,駭客便會將使用者導向Microsoft Learn的DNS故障排除網頁,但假如使用者點選How to fix按鈕,就會看到「指示」,要求按下特定快速鍵(視窗鍵+X)並執行PowerShell或是終端機,然後在視窗裡先後按下Ctrl+V及Enter。一旦使用者依照指示操作,電腦就會執行以Base64編碼處理過的PowerShell命令。 

究竟駭客何時擅自將惡意指令複製到剪貼簿?答案就是使用者按下How to fix之後,會同時觸發HTML檔案內嵌的JavaScript指令碼特定功能函數呼叫。

因此,使用者後續在終端機貼上剪貼簿的內容,就會執行攻擊者下達的惡意命令。駭客會先執行ipconfig /flushdns,然後下載AutoIT執行檔及惡意指令碼,從而在受害電腦部署惡意軟體。此外,上述作業執行完成後,電腦還會顯示操作成功與要求使用者重新載入網頁的訊息,此舉看似正常,使得受害者難察覺有異。

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