WHEN USERS ATTACK — Vimeo also used by legitimate user who posted booby-trapped content. Getty Images Ars Technica was recently used to serve second-stage malware in a campaign that used a never-before-seen attack chain to cleverly cover its tracks, researchers from security firm Mandiant reported Tuesday. A benign image of a pizza was uploaded to a third-party website and was then linked with a URL pasted into the “about” page of a registered Ars user. Buried in that URL was a string of char...