駭客藉由惡意程式SnipBot竊取機密資料
支付動態 · 2024-09-27

使用惡意軟體RomCom從事攻擊行動的駭客組織,近期打造了新的變種程式SnipBot,並將其用於對多個領域的企業組織從事間諜活動,搜括受害電腦的機敏資料

根據逆向工程的結果進行分析,駭客透過釣魚郵件啟動整個感染鏈,一旦使用者點選其中的URL,就會下載對方偽裝成PDF檔案的惡意程式下載工具,此執行檔搭配合法的證書簽章,並採用兩種手法迴避沙箱的偵測。

其中一種是比對經過雜湊處理的名稱,以便確認原始檔名;另一種則是檢查特定的機碼,確認是否有超過100項最近開啟過的檔案,而這麼做的目的,就是確認受害電腦是否為沙箱環境。

再者,這個惡意程式下載工具,同時利用視窗訊息為基礎的混淆手法,將惡意程式碼區分為多個區塊。此外,駭客也將C2網域、動態解析的API功能函數進行加密處理,防堵靜態偵測機制。

一旦此惡意程式下載工具執行,就會從C2網域嘗試取得PDF檔案及SnipBot有效酬載。此惡意程式的主程式能讓攻擊者於受害電腦執行命令,或是上傳及下載檔案的功能,再者,攻擊者也能從伺服器下載相關附加模組,以便執行進一步的活動。

實際上,駭客如何運用SnipBot?在其中一起攻擊行動裡,他們試圖收集受害組織內部網路資訊,接著將電腦裡的文件檔案、雲端檔案共享服務OneDrive的檔案,藉由WinRAR打包,並透過PuTTY外傳,這一系列竊取資料的過程,駭客也企圖藉由AD Explorer建立本機AD資料庫的快照。

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