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dc$5$ff$7$ee$-$f$39$d$-455$d$-$a$803-51$c$8$d$1$f$18826[$Based on Cisco CyberOps Associate CBROPS $(200-201)]$

In a high$-$end securities organization, the IT manager is receiving multiple requests for issues with systems. Upon investigating further, he finds an issue with the concerned systems; that is$,$ the users downloaded a file from a website, and after they executed the file, the system is arbitrarily responding to keyboard commands. What type of malware has possibly transpired?

A $$ Worm

B $$ DoS attack

C $$ MITM attack

D $$ Logic bomb