What is it?
dl.exe is a file associated with the W32.Bagz@mm worm

What does it do?
W32.Bagz@mm is a mass-mailing worm that uses its own SMTP engine to send itself to email addresses gathered from the infected computer.

When W32.Bagz@mm is executed, it does the following:

1. Creates the following copy of itself:
   
   %System% utorial.doc <spaces> .exe
   
   Note: %System% is a variable that refers to the System folder. By default this is C:WindowsSystem (Windows 95/98/Me), C:WinntSystem32 (Windows NT/2000), or C:WindowsSystem32 (Windows XP).
2. Adds the value:
   
   "syslogin.exe" = "syslogin.exe"
   
   to the registry key:
   
   HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRun
   
   so that the worm is executed every time Windows starts.
3. Creates the following files:
   • %System%dl.exe
   • %System%syslogin.exe
4. Disables the Windows firewall.
5. Downloads and executes remote files.
6. Installs its own network driver to bypass local firewalls.

Removal
@symantec