Ferguson's revelation came just days before the two sides' Champions League second round tie, a game in which Benzema netted for the Ligue 1 champions.
Aulas accused United of trying to rock the Lyon ship, and he believes there would be an outcry if the situation was reversed.
"As soon as Lyon is interested in a player of another French club, one shouts with the scandal," Aulas was quoted as saying in L'Equipe.
"But a few days before facing Manchester United, I read here or there that Ferguson will make a proposal for Benzema.
"If that is not destabilization...".