Computer Trojans were named after the ingenious ploy by Greek Hero Odysseus to infiltrate the impenetrable city of Troy using a giant wooden horse filled secretly filled with warriors presented to the Trojans in the guise of a gift. Similarly, computer Trojans also work making use of disguises to fool unsespecting users into being attacked by the malware. Trojans are disguised as handy programs that are designed to install a rootkit or backdoor on the computer systems they come into contact with. These rootkits or backdoors are a means for attackers to regain access to the infected system at a latter point in time. Rootkits are created after Trojan attacks and hide themselves in the operating system’s (OS’s) tools. This makes them nearly impossible to be detected. One of the most commonly used Trojan programs is Back Orifice. The program enable attackers to take complete control of the infected system, much like how the Windows XP Remote Desktop works, only worse. It is worse because the user has no knowledge of what is transpiring on his or her computer that is at the mercy of the attacker. The Back Orifice has been at large since 1999 and now marketed and distributed as an administrative tool instead of a tool for hacking.
Different types of Trojan programs make use of different ports to serve their purposes. The W32.Korgo.A uses ports 13, 2047, and 3067. The Backdoor.Rtkit.B uses port 445. The Backdoor.Systsec, Backdoor.Zincite.A uses 1034. W32.Beagle.Y@mm uses port 1234. The W32.Mytob.MX@mm uses port 7000. Port 6667 is used by the Trojan programs Agobot, Linux.Backdoor.Kaitenh, Backdoor.IRC.Flood.E, Backdoor.IrcContact, Backdoor.Slackbot.B, Backdoor.Hacarmy.C, Backdoor.Clt, Backdoor.Spigot.C, and Backdoor.DarkFtp. The Backdoor.Danton program uses port 6969. And ports 4661, 4242, 8080, 4646, 6565, and 3306 are used by Trogram program Backdoor.Nemog.C. Trojan programs using common ports are more easily detected than ones that use familiar ports like 80 and 53.
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