俄羅斯駭客FlyingYeti利用WinRAR漏洞對烏克蘭發動網釣攻擊,目的是散布惡意程式CookBox並控制受害電腦
支付動態 · 2024-06-05

雲端服務業者Cloudflare旗下威脅情報團隊Cloudforce One揭露俄羅斯駭客組織FlyingYeti的網路釣魚攻擊行動,這些駭客針對當地民眾而來,以政府恢復收取公營事業費用的政策為誘餌,散布名為CookBox的惡意程式

然而若是收信人照做,點選下載按鈕,電腦就會向Cloudflare Worker發出HTTP POST請求,對方藉此過濾目標,完成後下載RAR壓縮檔到受害電腦。

此壓縮檔內含數個檔案,其中一個檔名帶有大量Unicode字元U+201F,此字元在Windows作業系統顯示為空格,攻擊者這麼做的目的,就是為了讓收信人降低戒心,忽略此檔案實際是CMD批次檔。

而這個壓縮檔內含另一個無害的付款發票PDF檔案,一旦收信人透過WinRAR開啟壓縮檔,並試圖檢視PDF檔案,就會觸發CVE-2023-38831,執行CMD檔案,從而啟動CookBox,而能讓攻擊者持續於受害電腦上活動。

值得留意的是,CMD檔案還會開啟壓縮檔裡的其他Word檔案,這些檔案內容看起來是烏克蘭官方文件,很有可能是用來轉移收信人的注意力。

對此,Cloudforce One採取反制行動,延後對方發動攻擊的時間,他們先是封鎖駭客使用的Cloudflare Worker,而對方企圖新帳號設置多個Cloudflare Worker,但後續皆遭到停用,導致駭客更改攻擊鏈,由GitHub存取前述RAR檔案。

研究人員向GitHub通報此事,該程式碼儲存庫下架相關專案,並移除釣魚網站。他們也提供PowerShell指令碼,並對於Splunk、微軟雲端資安資訊及事件管理(SIEM)平臺Sentinel提供相關的偵測規則,來識別駭客駭客在受害電腦觸發CVE-2023-38831的情況。

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