Sean Michael Kerner, writing for eWeek: A browser hijacking operation initially reported to have 250 million victims by security firm Check Point isn't quite that large, according to a new analysis by Microsoft. On June 1, security firm Check Point reported that a browser hijacking operation called "Fireball" had already claimed 250 million victims. According to a Microsoft analysis published June 22, Check Point's estimate of the number of victims was "overblown" and the attack is not nearly as widespread as initially reported. The Fireball attack is a browser hijacking that is potentially able to download malware onto victims' systems, as well as manipulate pageviews and redirect search requests. Check Point's initial analysis claimed that Fireball was being bundled as part of free software downloads to unsuspecting users. "Indeed, we have been working with Microsoft on their analysis, feeding them with some additional data," Maya Horowitz, group manager of threat intelligence at Check Point, said in a statement sent to eWEEK. "We tried to reassess the number of infections, and from recent data we know for sure that numbers are at least 40 million, but could be much more."