The Office of Personnel Management repels 10 million attempted digital intrusions per month—mostly the kinds of port scans and phishing attacks that plague every large-scale Internet presence—so it wasn’t too abnormal to discover that something had gotten lucky and slipped through the agency’s defenses. In March 2014, for example, OPM had detected a breach in which blueprints for its network’s architecture were siphoned away. But in this case, the engineers noticed two unusually frightening details. First, opmsecurity.org had been registered on April 25, 2014, which meant the malware had probably been on OPM’s network for almost a year. Even worse, the domain’s owner was listed as “Steve Rogers”—the scrawny patriot who, according to Marvel Comics lore, used a vial of Super-Soldier Serum to transform himself into Captain America, a member of the Avengers.
Registering sites in Avengers-themed names is a trademark of a shadowy hacker group believed to have orchestrated some of the most devastating attacks in recent memory.