Crossword Genius

Malware which is disguised as standard software (6)

Ross

I believe the answer is:

trojan

(Other definitions for trojan that I've seen before include "Dedicated worker" , "Sort of horse" , "Traditional type of horse" , "Hard-working, trustworthy person (but, of a horse, untrustworthy!)" , "This horse once concealed Greek warriors bent on breaking a siege" .)

I've seen this clue in The Times and The Sunday Times.
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