Windows遠端協助工具「快速助手」遭到濫用,駭客從事勒索軟體Black Basta攻擊行動
· 2024-05-16

經濟動機的駭客組織Storm-1811發動語音網路釣魚攻擊,企圖在受害組織部署勒索軟體Black Basta,而在網釣攻擊的過程當中,他們先是轟炸目標人士的電子郵件信箱,然後再致電表明能夠提供協助,要求使用者依照指示啟動遠端協助工具「快速助手(Quick Assist)」

大多數人可能對於快速助手這個名稱感到冒生,這項工具微軟在Windows 10導入,主要用途是提供技術人員能透過網際網路遠端協助用戶排除問題。微軟最早提供類似的功能是在Windows XP作業系統上,當時叫做「Windows遠端協助(Windows Remote Assistance)」。

一旦使用者依照指示允許攻擊者進行控制,對方就會透過cURL命令下載一系列的批次檔或是ZIP壓縮檔,用途是傳送惡意酬載。研究人員看到攻擊者會使用QBot,但也有下載遠端管理工具的情況。

研究人員指出,攻擊者運用QBot傳遞Cobalt Strike及其他惡意酬載,而遠端管理工具ScreenConnect則是用於進行橫向移動,至於NetSupport Manager,對方拿來安裝其他惡意程式,或是對受害電腦執行命令。在部分攻擊行動裡,駭客也會濫用OpenSSH來建立SSH隧道,以便持續在受害環境行動。

攻擊者在結束通話後,會進一步進行偵察並橫向移動,然後使用PsExec於受害組織的網路環境部署勒索軟體並加密檔案。

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