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Just when you thought it was safe to go back on the Internet, anti-virus experts are warning that PCs infected by the SoBig.F worm may on Friday become part of an as-yet unknown attack.

Experts at both Sophos Inc. and F-Secure Corp. say that the worm is programmed to automatically connect to one of several machines controlled by the worm's creator. Once the connection is established, the worm will download and execute an unknown piece of code. It's not known what the program is designed to do, but experts fear it may involve a massive distributed denial-of-service (DoS) attack or something similar.

The downloads are set to commence at 3 p.m. EDT Friday and end three hours later.

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