Local Security Authority Subsystem Service ( LASS ) http://en.wikipedia.org/wiki/LSASS

Sasser Worm Spreading Through LSASS Exploit http://news.netcraft.com/archives/2004/05/01/sasser_worm_spreading_through_lsass_exploit.html

Microsoft Security Bulletin MS04-011 http://www.microsoft.com/technet/security/bulletin/ms04-011.mspx