Malicious Office (OOXML) — malware analysis report

Heuristics 8

• VBA project inside OOXML medium 6 related findings OOXML_VBA
  Document contains a VBA project — VBA macros present
• WScript.Shell usage critical OLE_VBA_WSCRIPT
  WScript.Shell usage
  Matched line in script

  Set objShell = VBA.CreateObject("WScript.Shell")

• Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
  VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  Matched line in script

  Set objShell = VBA.CreateObject("WScript.Shell")

• CreateObject call high OLE_VBA_CREATEOBJ
  CreateObject call
  Matched line in script

  Set MyRequest = CreateObject("WinHttp.WinHttpRequest.5.1")

• cmd.exe reference in VBA high OLE_VBA_CMD
  cmd.exe reference in VBA
  Matched line in script

      objShell.Run ("cmd.exe /c" & "" & Named & ""), 0

• VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
  Triggers on the COMBINATION of two tokens co-occurring in the same compiled VBA/cache stream: an auto-execution entry point (Auto_Open / AutoOpen / Document_Open / Workbook_Open / Auto_Close / AutoClose) AND a shell/download/object-execution token (Shell, CreateObject, GetObject, PowerShell, cmd.exe, URLDownloadToFile, WinHttp, XMLHTTP, ADODB.Stream, ShellExecute, ExecuteExcel4Macro). Neither token alone fires it — it is the pairing that flags p-code-only or source-extraction-failure macro documents where the visible VBA source is unavailable. The matched tokens are named in the detail line below.
• Document_Open macro low OLE_VBA_DOCOPEN
  Document_Open macro
  Matched line in script

  Private Sub Document_Open()

• Embedded URL info EMBEDDED_URL
  One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
  URL https://app.cymulate.com/api/phishing/clicked/5fa0c4835332cb48113ccd18 Referenced by macro

  • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasReferenced by macro
  • http://schemas.microsoft.com/office/drawing/2014/chartexReferenced by macro
  • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexReferenced by macro
  • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexReferenced by macro
  • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexReferenced by macro
  • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexReferenced by macro
  • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexReferenced by macro
  • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexReferenced by macro
  • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexReferenced by macro
  • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexReferenced by macro
  • http://schemas.openxmlformats.org/markup-compatibility/2006Referenced by macro
  • http://schemas.microsoft.com/office/drawing/2016/inkReferenced by macro
  • http://schemas.microsoft.com/office/drawing/2017/model3dReferenced by macro
  • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsReferenced by macro
  • http://schemas.openxmlformats.org/officeDocument/2006/mathReferenced by macro
  • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingReferenced by macro
  • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingReferenced by macro
  • http://schemas.openxmlformats.org/wordprocessingml/2006/mainReferenced by macro
  • http://schemas.microsoft.com/office/word/2010/wordmlReferenced by macro
  • http://schemas.microsoft.com/office/word/2012/wordmlReferenced by macro
  • http://schemas.microsoft.com/office/word/2018/wordml/cexReferenced by macro
  • http://schemas.microsoft.com/office/word/2016/wordml/cidReferenced by macro
  • http://schemas.microsoft.com/office/word/2018/wordmlReferenced by macro
  • http://schemas.microsoft.com/office/word/2015/wordml/symexReferenced by macro
  • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupReferenced by macro
  • http://schemas.microsoft.com/office/word/2010/wordprocessingInkReferenced by macro
  • http://schemas.microsoft.com/office/word/2006/wordmlReferenced by macro
  • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeReferenced by macro

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