Group-IB, Singapore-based cybersecurity company specializes in attack prevention, tracked Silence early on and judged its members to be familiar with white-hat security. The group started timidly in 2016, learning the ropes by following the path beaten by other hackers. Since then, it managed to steal at least $4.2 million, initially from banks in the former Soviet Union, then from victims in Europe, Latin America, Africa, and Asia. In September 2018, the researchers were aware of bank jobs that brought the group over $800,000.
Source: https://www.bleepingcomputer.com/news/security/silence-advanced-hackers-attack-banks-all-over-the-world/