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It hasnt had a Sasser-sized impact, but it has the potential (if Sasser doesnt infect the unpatched systems first).Д«obax is a little more dangerous than Sasser, as it deletes and changes system files and sets up an open e-mail relay to send spam from a victims machine.

The fourth in the family, Bobax uses the same LSASS vulnerability that the Sasser family did. Our top threat of the week is the Bobax.D worm. If you havent updated and havent gotten Sasser, youre lucky. Sasser.B is also still at the top of the active infector lists, even though Microsoft reports that the number of downloads of the MS04-011 update, which could block a Sasser infection, is four times the amount of previous ones. But the most prolific threats are still the e-mail viruses Netsky.P, Bagel.X and Dumaru.

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The Gaobot and Wallon worms also attempt to exploit Windows vulnerabilities from earlier security bulletins. Since Sasser opened the door, weve seen more than a half a dozen new names and several versions of each-Cycle, Gaobot, Bobax, Korgo, Kibuv and Sdbot. The вЂњtop 10вЂќ for May were headed by Sasser.Its been another busy week, with several new LSASS vulnerability-exploiting worms appearing. It says its products protect against 90,811 different viruses. Sophos found a total of 959 new viruses on the internet in May, the highest number since December 2001. The number of new viruses released on the internet in May hit a two-and-a-half-year high last month, anti-virus vendor Sophos said. Korgo cannot find and decode the passwords stored on the hard drive. Journalist Thomas Kreitschmann said the Korgo hacker would need to do a lot of analytic work to distinguish the keystrokes of passwords or credit cards from other things typed into the computer.

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PC Professionell, a German magazine that suggested Thursday that Korgo aggressively harvested passwords, downgraded its warning Friday. The computer user does not realize the keystroke logger is monitoring him. The effective versions of Korgo arrive unawares, without needing an e-mail as their carrier. F-Secure, a Finnish virus-hunting company, has suggested Korgo may be the work of a Russian hacker group dubbed the вЂњHangup TeamвЂќ.

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Microsoft released the patch 13 April.ДЄ German teenager, Sven Jaschan, has admitted writing Sasser, claiming it was an antibody to kill off nastier viruses on the loose. вЂњAfter all the fuss about Sasser, a computer user ought to be quite embarrassed at having still left the security hole open,вЂќ said Fischer. Anti-virus companies raised their threat assessment of Korgo after finding it had become widespread. Neither worm affects Windows 98 or other operating systems. The worm exploits the same flaw in Windows as Sasser, the worldвЂ™s biggest virus since late April.

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The antidote is a free programme code-named вЂњKB835732вЂќ from the Microsoft website, but analysts said the spread of Korgo suggests millions of PC users have not yet taken the medicine.Д¬hristoph Fischer, a German expert on viruses, said there was no sign yet that Korgo was leading to an upsurge in internet traffic. Korgo first showed up May 22 and is now circulating in at least six versions. HAMBURG вЂ“ Korgo, a new virus that can infect Windows 2000 and XP systems simply by connecting them to the Internet, continued to spread worldwide Friday, installing a tiny spy that can record what keys were pressed at secret moments such as typing passwords.