A self-e-mailing worm is threatening to impose a Sober holiday on individuals and companies alike.

The worm created havoc in October by getting into systems and e-mailing itself to every e-mail address it could find. Then a second variant, Sober.B, popped up at the end of last week, attempting to intrigue people with subject lines referencing George W. Bush.

The B variant was given a low-risk status as it is relatively easy to stop and remove, and it seemed to have been stopped in its tracks. However, the weekend saw the German writers release the same worm but with different subject lines.

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