The file %SysDir%\LAST.EXE is a computer worm.
The worm %SysDir%\LAST.EXE is a self-replicating malicious program,
which uses a computer network to send copies of itself to other
computers.
You must fix the %SysDir%\LAST.EXE problem as soon as possible!
Delete the file %SysDir%\LAST.EXE from all infected computers in your network.
Set up your network firewall against %SysDir%\LAST.EXE intervention.

%SysDir%\LAST.EXE Information and Removal:
LAST.EXE is known as: Trojan.Mumuboy [PCTools] Trojan-Spy.Win32.Sincom.i [Kaspersky Lab] PWS-Sincom [McAfee] Troj/BGirlB-A [Sophos] Worm:Win32/Mumu.A [Microsoft] Trojan-Spy.Win32.Sincom [Ikarus] Win-Trojan/Mumuboy.20480 [AhnLab] packed with UPX [Kaspersky Lab].
MD5 of LAST.EXE = A65F3D8C0459151EFAFA9AFAC26E4098
LAST.EXE size is 20480 bytes.
Full path on a computer: %SYSTEM%\LAST.EXE
Related Files:
%SYSTEM%\LAST.EXE
%SYSTEM%\B.TMP
%SYSTEM%\BBOY.DLL
%SYSTEM%\IPCPASS.TXT
%SYSTEM%\KAVFIND.EXE
%SYSTEM%\MUMU.EXE
%SYSTEM%\PSEXEC.EXE