Threat Description



Aliases: NetSky.Y, W32/NetSky.Y@mm
Category: Malware
Type: Email-Worm
Platform: W32


NetSky.Y worm was discovered late night on April 20th, 2004. It is similar to the Netsky.X variant found earlier during the same day. It is repacked with PEpack.


Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.

Eliminating a Local Network Outbreak

If the infection is in a local network, please follow the instructions on this webpage:

Technical Details

For more information on Netsky.X see: Netsky.X

Netsky.Y sends email messages that look as follows:

Subject: Delivery failure notice (ID-random number)  Attachment: www.random domain name.random user name.session.random  

The body of the message contains one of the following words:

Partial, External, New or Delivered  

followed by the text:

message is available  


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