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Sasser.B is a worm that spreads via the Internet by exploiting the LSASS vulnerability in remote computers. This vulnerability is critical for Windows XP/2000 operating systems that are not properly updated.
Sasser.B restarts the computer automatically when it attempts to exploit the already mentioned vulnerability.
Sasser.B only spreads automatically to Windows XP/2000 computers. However, computers with other Windows operating systems can also be a source of transmission when a malicious user runs the file containing the worm in any of these computers.
If you have a Windows XP/2000 computer, it is highly recommendable to download the security patch for the LSASS vulnerability from the Microsoft website.
Sasser.B is easy to recognize, as it restarts Windows XP/2000 computers when it attempts to affect them by exploiting the LSASS vulnerability. When this action is carried out, Sasser.B displays the following message on screen: