For years, members of the Russian cybercrime cartel Trickbot unleashed a relentless hacking spree on the world. The group attacked thousands of victims, including businesses, schools, and hospitals. “Fuck clinics in the usa this week,” one member wrote in internal Trickbot messages in 2020 about a list of 428 hospitals to target. Orchestrated by an enigmatic leader using the online moniker “Stern,” the group of around 100 cybercriminals stole hundreds of millions of dollars over the course of roughly six years.

Despite a wave of law enforcement disruptions and a damaging leak of more than 60,000 internal chat messages from Trickbot and the closely associated counterpart group Conti, the identity of Stern has remained a mystery. Last week, though, Germany’s federal police agency, the Bundeskriminalamt or BKA, and local prosecutors alleged that Stern’s real-world name is Vi­ta­ly Ni­ko­lae­vich Kovalev, a 36-year-old, 5-foot-11-inch Russian man who cops believe is in his home country and thus shielded from potential extradition.

A recently issued Interpol red notice says that Kovalev is wanted by Germany for allegedly being the “ringleader” of a “criminal organisation.”

“Stern’s naming is a significant event that bridges gaps in our understanding of Trickbot—one of the most notorious transnational cybercriminal groups to ever exist,” says Alexander Leslie, a threat intelligence analyst at the security firm Recorded Future. “As Trickbot’s ‘big boss’ and one of the most noteworthy figures in the Russian cybercriminal underground, Stern remained an elusive character, and his real name was taboo for years.”

Stern has notably seemed to be absent from multiple rounds of Western sanctions and indictments in recent years calling out alleged Trickbot and Conti members. Leslie and other researchers have long speculated to WIRED that global law enforcement may have strategically withheld Stern’s alleged identity as part of ongoing investigations. Kovalev is suspected of being the “founder” of Trickbot and allegedly used the Stern moniker, the BKA said in an online announcement.