“Ebrahim Vaker,” who left his Telegram handle card on the briefly defaced page of the University of Maryland, Baltimore County, said he was 23 and the leader of the “Iranian Anonymous Team,” created last year.

“Most of these attacks are a sign of protest,” Vaker told The Verge. He said the UMBC defacement was the biggest attack yet from his seven-member team, whose members range as young as 18.