Facebook Said to Work With FBI on Malware Attack Investigation

Facebook Inc., operator of the largest social network with more than 1 billion members, is working with the U.S. Federal Bureau of Investigation to probe a malware attack, people with knowledge of the matter said.

Facebook said yesterday that it was subjected to a “sophisticated attack” by hackers last month, without saying where the attack originated. Investigators haven’t found any evidence that user data was compromised, Menlo Park, California-based Facebook said on its website. The people who discussed the FBI’s involvement asked not to be identified, citing the sensitive nature of the probe.