Happy99 - Technical Details

Technical Details

Also known as "Ska", the worm spreads through email attachments and usenet. When executed, animated fireworks and a "Happy New Year" message are shown. The worm modifies Winsock, a Windows communication library, to allow itself to spread. The worm then attaches itself automatically to all subsequent emails and newsgroup posts sent by a user. The worm modifies a registry key to automatically start itself when the computer is rebooted. In some cases, the program may cause several error messages to appear.

The worm was written by a French virus writer known as "Spanska". Other than propagating itself, the worm does no further damage to an infected computer. The worm typically uses port 25 to spread, but uses port 119 if port 25 is not available. The executable of the worm is 10000 bytes in size; a list of spammed newsgroups and mail addresses is stored on the infected hard drive. The worm will only spread if the Winsock library is not set to read-only.

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