木馬程式Orcinius透過假造的VBA程式碼進行散布
支付動態 · 2024-07-03

研究人員針對名為Orcinius的RAT木馬程式的攻擊行動提出警告,特別的是,對方在Excel巨集採用了較為少見的攻擊手法,不僅有機會迴避偵測,還會隱藏Office對於來自網際網路的巨集的警示訊息

這個試算表內含巨集,不過研究人員提到,這些駭客運用名為VBA stomping的攻擊手法,利用事先解析的位元碼(Bytecode)取代原本的VBA巨集內容,使得用戶檢視該試算表巨集不會顯示任何內容,並使得打開檔案的時候看似無害。

所謂的VBA stomping,指的是攻擊者利用假的VBA程式碼(p-code)取代原本執行VBA原始碼的流程,由於大部分的資安分析工具及防毒軟體通常會針對VBA原始碼進行檢查,使得這種手法有可能躲過相關檢測。

然而,研究人員發現,一旦使用者開啟試算表,這個檔案就會執行巨集的內容,先是透過竄改使用者電腦Windows作業系統的登錄機碼,目的是隱藏Office的警示訊息,然後使用EnumThreadWindows的功能函式列出正在執行的視窗,並在系統登錄機碼寫入一筆Excel啟動即載入的鍵值,確保持續執行,接著存取經過編碼處理的URL網址,並且運用WScript.Shell進行下載,隨後運用SetWindowsHookEx函式監控鍵盤輸入的內容,並且產生數個隨機的計時器,用來啟動、嘗試下載檔案。

他們針對Orcinius參照Synaptics.exe、cache1.exe的行為進行比對,指出該木馬程式與Remcos、AgentTesla、Neshta、HTMLDropper等多款惡意程式有關,而它們之間的共通點在於,有可能會將攻擊程式偽裝成Synaptics.exe散布。

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