Bisonal: 10 years of play

By Warren Mercer, Paul Rascagneres and Vitor Ventura.

Update 06/03/20: added samples from 2020.

Executive summary
Security researchers detected and exposed the Bisonal malware over the past 10 years. But the Tonto team, the threat actor behind it, didn’t stop.The victimology didn’t change over time, either. Japanese, South Korean and Russian organizations were the prime targets for this threat actor.The malware evolved to lower its detection ratio and improve the initial vector success…

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