Trojans and Backdoors


Trojan horses and malware have a long history. These tools represent a real danger to the security of end user systems. If an attacker can trick or seduce a user to install one of these programs, the hacker can gain full control of the system. Much of this malware works under the principle of "you cannot deny what you must permit," meaning that these programs use ports such as 25, 53, and 80ports the administrator usually has left open. If the programs don't use these ports, the hacker always has the option of using port redirection or covert communication channels. Because port redirection allows the hacker to redirect traffic to open ports, they are a dangerous category of tool.

This Chapter begins by reviewing the history of Trojans. It then discusses specific Trojan types and their means of transmission. You will see that Trojans can range from benign to dangerous. Some Trojans are written specifically to kill hard drives or disable software firewall protection. Next, this Chapter looks at covert communications, port redirection, and backdoors. Each of these adds to the hacker's ability to secretly move data into and out of the network. Spyware and keystroke loggers are also discussed. Finally, this Chapter looks at some methods for detecting various types of malicious programs.

An Overview of TrojansThe History of Trojans

Part I: Exam Preparation

The Business Aspects of Penetration Testing

The Technical Foundations of Hacking

Footprinting and Scanning

Enumeration and System Hacking

Linux and Automated Security Assessment Tools

Trojans and Backdoors

Sniffers, Session Hijacking, and Denial of Service

Web Server Hacking, Web Applications, and Database Attacks

Wireless Technologies, Security, and Attacks

IDS, Firewalls, and Honeypots

Buffer Overflows, Viruses, and Worms

Cryptographic Attacks and Defenses

Physical Security and Social Engineering

Part II: Final Review

Part III: Appendixes

Appendix A. Using the ExamGear Special Edition Software

Certified Ethical Hacker Exam Prep
Certified Ethical Hacker Exam Prep
ISBN: 0789735318
EAN: 2147483647
Year: 2007
Pages: 247
Authors: Michael Gregg © 2008-2020.
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