When iWork '09 was released this January, a pirated version of the application spread a trojan horse named iWorkServices. Now it seems that the trojan in question is being used in denial-of-service attacks on various web sites. (In short, the virus is controlling unwitting zombie computers, sending them to specific sites with such persistence that the sites crumble under the non-stop requests.) The takeaway: Macs can get malware the same way Windows computers more often than not do—through careless downloading practices. [ZDNet]