W32.Donk.R

W32.Sasser.E.Worm is a minor variant of W32.Sasser.Worm. It attempts to exploit the LSASS vulnerability, described in Microsoft Security Bulletin MS04-011, and spreads by scanning randomly selected IP addresses for vulnerable systems.

W32.Sasser.E.Worm differs from W32.Sasser.Worm as follows:

	Uses a different mutex: SkynetNotice.
	Uses a different file name: lsasss.exe.
	Creates a different value in the registry: "lsasss.exe"
	Uses different port numbers, used by FTP server and the remote shell: 1023 and 1022.
	After 2 hours of running it displays a message.
	It deletes the values from the registry, which are known to be installed by Trojan.Mitglieder, W32.Beagle.W@mm, and W32.Beagle.X@mm.
	The name of the file retrieved from the FTP server is followed by _update.exe.
	The worm logs data into the file C:\ftplog.txt.
	Has an updated routine for finding vulnerable computers. W32.Sasser.E.Worm sends an ICMP echo request before attempting to make a connection. This change may prevent the worm from properly executing on Windows 2000 systems.

W32.Sasser.E.Worm can run on, but not infect, Windows 95/98/Me computers. Although these operating systems cannot be infected, they can still be used to infect vulnerable computers.

Removal Instructions For Symantec & Norton Users:

Before you begin:
If you are running Windows 2000 or XP, and have not yet done so, you must patch for the vulnerability described in Microsoft Security Bulletin MS04-011. If you do not, it is likely that your computer will continue to be reinfected.

What to do if the computer shuts down before you can patch or get the tool
This threat can cause Windows to keep shutting down and restarting. This can prevent you from installing the Microsoft patch or downloading the tool described below. Notes:

	You may have to try this several times, as you only have about 20 seconds to do steps 3 to 6.
	This will not work on Windows 2000.

To prevent the shut down, do the following:

1. Disconnect the computer from the network/Internet connection. (Disconnect the cable if necessary.)
2. Restart the computer.
3. As soon as Windows opens and you see the Windows desktop, click Start > Run.
4. Type:
   
   cmd
   
   and press Enter.
   
   
5. Type:
   
   shutdown -i
   
   and press Enter.
   
   
6. In the Remote Shutdown Dialog that opens, do the following:
   
   1. Click Add, type your computer name into the Add Computers dialog box, and then click OK.
   2. In the "Display warning for" field, type 9999.
   3. Type the following text in the Comment box:
      
      Delay Lsass.exe shutdown.
      
      
   4. Click OK.
      
      
7. Reconnect the network/Internet connection.
8. Connect to the Internet, and get the patch. Then continue with the steps described below.