This, time, it distributes Vundo trojan in its payload. Following the previous variant of Ackantta mass-mailing worm, a new modification (B) is making the rounds now.Automated analysis is available here.Automated analyses are available for download of the latest version of the Vundo worm. This version of Vundo is the latest in a series of viruses to be distributed in the wild that have been released by the W3W3W4 virus, including the W4 virus and W3 virus.”]
Source: http://blog.threatexpert.com/2009/03/new-variant-of-ackantta.html