NetSky.W worm variant was discovered on April 16th, 2004.Although it has been just discovered, this variant is much more similar to NetSky.P or NetSky.Q than to any of the later variants. In fact, its structure bears a striking resemblance to that of NetSky.P, so only some differences among them will be listed on this description.This variant does not spread through P2P networks, as NetSky.P does.
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Upon execution Netsky.W copies itself as VisualGuard.exe file to the Windows folder. The worm adds a startup key for itself into System Registry:
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] "NetDy" = "%WinDir%\VisualGuard.exe"
where %WinDir% represents Windows folder name.
Additionally the worm drops the following files into Windows folder:
zipped.tmp base64.tmp zip1.tmp zip2.tmp zip3.tmp
Most of the email spreading functionality is similar or identical to NetSky.P.
NetSky.W worm removes Registry keys of several Bagle worm variants if it finds them on an infected computer.