computer virus
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which can be exploited to allow installation of a Trojan horse) Social Engineering (e.g. A hacker tricking a user into installing a Trojan horse by communicating with them directly)
Additionally, there have been reports of compilers which are themselves Trojan horses. In addition to compiling code to executable form they also insert code into the output executables which cause them to become Trojan horses. This is still distinct from self-replication as the process is not automatic.
Removal
Antivirus software is designed to detect and delete Trojan horses ideally preventing them from ever being installed. It may be possible to remove a Trojan horse manually given a full understanding of how that particular Trojan horse operates, however if it is possible that a Trojan horse has been used by a hacker to access a computer system it will be difficult to know what
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