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Sasser is a denial of service (DoS) worm that exploits a flaw in a Windows 2000 or non-64-bit Windows XP machine's Local Security Authority Subsystem Service (LSASS). IT security pros must install a patch to prevent unattended systems from falling prey to Sasser's destruction. However, administering the patch is a challenge because infected systems keep rebooting before it can be installed.
Sasser causes a stack-based buffer overflow in certain Active Directory service functions in the LSASRV.DLL file of the LSASS. Applying the patch provided in Microsoft Security Bulletin MS04-011 is the only way to protect your system from reinfection.
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Here is the solution for expanding the amount of time it takes before your computer reboots due to the Sasser worm. Keep in mind that you will have only about 20 seconds to complete the steps, and you must already know the system's name before beginning this process:
To find your computer's name, open Control Panel and click on the System icon.
- Disconnect from the Internet.
- As soon as possible in the boot process, click on Start, Run, and enter cmd to open the command line interface.
- At the DOS prompt, enter shutdown -i and press [Enter].
This command opens the control panel for remote administration of other systems, but for this process you will just need to enter the name of your computer.
- Click Add, enter the name, and then click OK.
- Now modify the warning message delay setting from the standard 20 (seconds) to a large number, such as 9999. After patching, you can reset the warning message delay if you wish.
That should temporarily disable the shutdown sequence long enough for you to log on to the Internet and download the patch.
An alternative method for stopping the reboot cycle on XP-only systems is to enter shutdown.exe –a at the command prompt. That aborts the shutdown process completely and is obviously much faster for XP systems.