CISA and ACSC have been monitoring ransomware, rootkits, spyware, trojans, viruses, and worms, but trojans dominated the landscape last year, when Agent Tesla, AZORult, Formbook, GootLoader, LokiBot, MouseIsland, NanoCore, Qakbot, Remcos, TrickBot and Ursnif were the top malware strains.
Some of the most prevalent malware families on the list have been around for more than five years, due to constant updates and evolution into multiple variants. Qakbot and Ursnif have been used for more than a decade.