Hackers Deploy “SUBMARINE” Backdoor in Barracuda Email Security Gateway Attacks

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Friday disclosed details of a “novel persistent backdoor” called SUBMARINE deployed by threat actors in connection with the hack on Barracuda Email Security Gateway (ESG) appliances.
“SUBMARINE comprises multiple artifacts — including a SQL trigger, shell scripts, and a loaded library for a Linux daemon — that together enable