These are applications that gain entry into the user’s system by
posing as something else, often as free screensavers. After gaining
entry into the system and being installed or run by the user, they
can manipulate user data. Trojans have different behaviour once
they gain access into the system. For example, some allow unauthorised
access to a remote user into the user PC by opening up
ports, some can act as keyloggers, and some can prevent applications
from running—especially anti-virus applications.
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