Companies are rooting out Conficker and Autorun worms from their networks, but attacks through the Web are still causing problems, according to Microsoft’s latest report. In the last half of 2012, the average number of infections by the two major wormlike programs, Conficker and Autorun, declined by more than a third compared with the total in 2011, the company said. While companies are slowly tackling the threat of worms, Web-based attacks—especially those that redirect a victim’s browser to a site hosting malicious code—have taken off, accounting for seven of the 10 top threats encountered by corporate users, the report stated.