SELF REPLICATION
A Trojan horse may itself be a computer virus, either by asking other users on a network, such as a instant-messaging network, to install the said software, or by spreading itself through the use of application exploits.
REMOVAL
Antivirus software is designed to detect and delete Trojan Horses and prevent them from ever being installed. Although it is possible to remove a Trojan Horse manually, it requires a full understanding of how that particular Trojan operates. In addition, if a Trojan horse has possibly been used by a outsider to access a computer system, it will be difficult to know what damage has been done and what other problems have been introduced. In situations where the security of the computer system is critical, it is advisable to simply erase all data from the hard disk and reinstall the operating system and required software.
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