
Sasser.B Worm
People running Windows are urged to update their virus definitions and run Windows Update.
More information can be found here:
Trend Micro - http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM_SASSER.B
Symantec Security Response - http://securityresponse.symantec.com/avcenter/venc/data/w32.sasser.b.worm.html
Microsoft - http://www.microsoft.com/security/incident/sasser.asp