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MyTob is August's "Playvirus" Responsible for 16.28% of the viral activity	By Tudor Raiciu, Technology and Science Editor 5th of September 2005, 11:20 GMT Adjust text size:


July was "suffocated" almost exclusively by the MyTob family of viruses. Netsky.P occupied the first position of the July top, but MyTob occupied 7 positions, amounting to 50% of the viral activity. According to Kaspersky, August's "playvirus" is MyTob.c, which was responsible for 16.28% of the viral activity. The security company says NetSky.q and Mytob.c have been fighting for first place in the ratings for several months now. These worms are very different: they exploit different vulnerabilities and were created a year apart. NetSky.q was fighting for supremacy against Mydoom and Bagle versions: judging by the results, NetSky seems to have won this war. A year later came Mytob, based on the source code of the very first Mydoom. Mytob is following the trail blazed by NetSky, and is NetSky.q's main competitor. We are witnessing an ongoing struggle between these two families with 13 versions of Mytob and 4 versions of NetSky in the rankings. Although it seems that Mytob is gaining the upper hand, a closer look shows that with 4 Mytobs and 3 NetSkys in the top 10 - neither worm is totally dominant. As for Zotob, Kaspersky has classified these worms as new versions of Mytob with the following correlations with Zotob: Zotob.a - Mytob.cg, Zotob.b - Mytob.cf, Zotob.c - Mytob.ch. Only versions .ch and cg are capable of replicating via email, while version .cf spreads by exploiting the MS05-039 vulnerability.

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