[ UPDATE: Dancho has more details on this attack ]
In an apology posted online, Gizmodo said the its ad sales team was tricked into running malicious ads purporting to be from Suzuki. This follows a similar attack that affected advertisements served from the New York Times site.
Here's the note from Gizmodo's editor:
Guys, I'm really sorry but we had some malware running on our site in ad boxes for a little while last week on Suzuki ads. They somehow fooled our ad sales team through an elaborate scam. It's taken care of now, and only a few people should have been affected, but this isn't something we take lightly as writers, editors and tech geeks. (And we would have noticed sooner except everyone on staff is on OS X or Linux for production machines.) Everything should be cleared up but you should be checking "qegasysguard.exe" if you're experiencing random popups. Be careful, load up some antivirus and make sure your system is clean. I'm sorry.