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cisco certification download.Computer viruses: are malicious software that infects computer files or areas of the system with the intent of producing undesirable results (e.g., deleting data, stealing information, or compromising the integrity of the system). In many instances, the130 Chapter 2 Network Security Devices and Cloud Servicesviruses are capable of multiplying themselves exponentially.Worms: are viruses that self-replicate over the network and can infect numerous vulnerable systems. In most cases, worms can execute malicious commands within a remote system without user intervention.Mail or mass mailing worm: A worm that sends itself via email. Loveletter. A@mm and W32/SKA.A@m (aka Happy99worm) are both mail worms, and each new email sent by a user will contain a copy of the above mail worm.Logic bombs: are a type of malicious code that is injected into legitimate applications. An attacker can set up a logic bomb to delete itself from the disk after performing certain malicious tasks on the system. Malicious tasks that a logic bomb can perform include deleting/corrupting files or databases, and executing special instructions after certain system conditions are met.Trojan horse: A type of malware that can both execute commands to delete files, steal data, and otherwise compromise the integrity of the underlying operating system. Attackers often use social networking to trick the attacked into installing a Trojan horse on their computer or mobile device. Trojan horses can also act as backdoor programs.Backdoor program: a type of malware with the help of which an attacker can remotely take control of the attacked person's system. Let's say an attacker installs certain backdoor programs on the compromised system, opening certain network ports to allow himself to connect and control the system.Exploit: - A malicious program designed to uncover and exploit single or multiple vulnerabilities. Malware Downloader: A malware program that allows an infected system to load and install other malicious programs from the Internet to perform other attacks.