Bottom line: The BKA and Brazilian authorities have effectively dismantled the organized crime group behind the attack.
What's happening: The BKA identified the group's leader, 35-year-old German national Hans Müller, and his accomplices as using the REvil ransomware gang's attack tools, compromising the systems of several major banks, including BNP Paribas and Santander.
What to do: Security teams should monitor the BNP Paribas system for any potential data leaks and implement additional security measures to prevent similar attacks on the Santander network.