Mydoom gets a new variant

As industry watchers declare Mydoom the worst virus ever, a variant has already started doing the rounds. Mydoom.B is programmed to attack Microsoft’s corporate web site as well as SCO’s.

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By  Peter Branton Published  January 29, 2004

As industry watchers declare Mydoom the worst virus ever, a variant has already started doing the rounds. Mydoom.B is programmed to attack Microsoft’s corporate web site as well as SCO’s. Mydoom has been rampaging across the internet this week, with security firms saying it is now the most widespread virus ever recorded. According to F-Secure, it was accounting for as much as 30% of all e-mail traffic worldwide yesterday. More than 100 million infected e-mails were estimated to have been sent within 36 hours of its launch. The variant, unsurprisingly dubbed Mydoom.B, includes some changes to subject lines, and interferes with a PC’s ability to access downloadable security software updates, which could protect against both variants. Both viruses are also programmed to launch a denial of service attack against Unix vendor SCO in two days time, February 1. SCO is seen as being under attack because of its controversial claim to hold copyright on key elements of the source code for Linux. Mydoom.B adds an attack to Microsoft’s domain, Microsoft.com. The company last year signed a deal with SCO to licence source code from it, a move which has given SCO badly-needed revenue to fund its Linux legal disputes. Last year the Blaster worm targeted Microsoft’s Windows Update service, by launching a denial-of-service attack against part of the company’s corporate site. Microsoft was able to defeat the threat fairly easily by changing the URL for the service targeted.

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