WASHINGTON, United States (AFP) — The massive theft of Yahoo user data disclosed last week came from “professional” hackers seeking to profit from the breach, according to an analysis by security researchers. The analysis published Wednesday by the security firm InfoArmor, which claims to have seen some of the data, contrasts with Yahoo’s claim that the attack was likely “state-sponsored,” but did suggest that stolen data was sold to a state-sponsored group at one point. […]