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電子郵件社交工程
-正確郵件軟體設定
國家資通安全會報技術服務中心
2
手法概述:
 安裝防毒軟體,確實更新病毒碼
 關閉信件自動下載圖片及其他內容
 取消信件預覽功能
 以純文字模式開 信件啟
 設定過濾 郵件機制垃圾
 電子簽章或加密
安裝防毒軟體,確實更新病毒碼
關閉信件自動下載圖片及其他 容內
5
關閉信件自動下載圖片及其他 容內
6
關閉信件自動下載圖片及其他 容內
7
關閉自動下載設定
關閉自動下載 HTML 郵件中的圖片
取消信件預覽功能
9
取消信件預覽功能
10
取消信件預覽功能
11
取消信件預覽設定
關閉郵件「自動預覽」
 
以純文字模式開 信件啟
13
不以 HTML 模式開 信件啟
14
不以 HTML 模式開 信件啟
15
以純文字模式開 信件啟
16
純文字模式讀取設定
以純文字模式讀取所有郵件
設定過濾 郵件機制垃圾
18
封鎖 郵件設定垃圾

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Notas del editor

  1. 如圖,當我們開啟信件後,信件內容若有外部圖片,電子郵件軟體會自動連線至網際網路下載圖片。若此為惡意圖片,則當使用者開啟信件的同時,下載的惡意圖片就已經發作,使用者必然措手不及。
  2. 因此我們建議使用者務必「關閉信件自動下載圖片及其他內容」的功能。在關閉此功能後,電子郵件軟體不會下載網際網路上的外部資訊,使用者開啟信件後僅會看到若干無法顯示圖片或內容的方格,即可知道此信件內容會連結至網際網路上。 通常此類信件不是惡意信件即是垃圾信件,建議使用者可直接刪除。
  3. 圖中右下方即為Outlook提供的信件預覽功能。使用者只需點選信件,信件的內容就會出現在右下方供使用者預覽。就如稍早所說,若此郵件內容是惡意圖片或內容,此時已經遭受駭客攻擊。
  4. 因此我們強烈建議使用者將此功能關閉。關閉預覽功能後,使用者點擊信件,就不會再預閱信件內容。使用者可以在未開啟該信件的情況下,判斷其是否為可疑信件,若確定為正常信件可選擇開啟(雙擊),可疑信件則可直接刪除。
  5. 在此信件內文中,僅是一般的文字內容,並無圖片或其他外部資訊,但使用者開啟此信件,仍然會遭受後門程式的入侵。 原因在於此信件是以HTML格式編寫而成,雖然表面上都是文字敘述,但背後的HTML語法是不是也像表示這樣乾淨呢? 我們來檢視此信件的原始檔。
  6. 當檢視原始檔後,我們赫然發現在信件內文的最後,隱藏了多個惡意圖片連結,當使用者開此HTML格式的信件,就有可能因此被植入後門程式。
  7. 有鑑於這類的攻擊手法,使用者應該以純文字模式開啟信件。在純文字模式下,HTML語法預設是無法執行的,駭客的惡意語法及連結,自然也起不了作用。
  8. 將已知假冒的寄件者電子郵件帳號加入「封鎖的寄件者」清單中,並選擇郵件的過濾方式(是放置在垃圾郵件資料夾還是直接刪除) 而使用寄件者的電子郵件來過濾社交工程郵件或者垃圾郵件的缺點是,現在的入侵者都會申請大量正常的免費電子郵件帳號來躲避篩選器的過濾