A Trojan is a program that enables an attacker to get nearly complete control over an infected PC. Frequently used tool by malicious hackers. When this program executes, the program performs a specific set of actions. This usually works toward the goal of allowing the trojan to survive on a system and open up a backdoor.
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Acidoor is a Trojan that gives a hacker unauthorized access to your computer. By default, it uses ports 4432 and 4433. It is unknown whether this trojan is still in circulation.