Type
Win32 worm
Description
W32/Netsky-J is a mass mailing worm that uses its own SMTP engine to email itself to addresses harvested from files on local drives.
In order to run automatically when the user logs on to the computer the worm copies itself to the file winlogon.exe in the Windows folder and creates the following registry entry:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\ICQ Net
=<Windows folder>\winlogon.exe -stealth
Read more: http://www.sophos.com/virusinfo/analyses/w32netskyj.html

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