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  2. Computer virus - Wikipedia

    en.wikipedia.org/wiki/Computer_virus

    A computer virus generally contains three parts: the infection mechanism, which finds and infects new files, the payload, which is the malicious code to execute, and the trigger, which determines when to activate the payload. Infection mechanism Also called the infection vector, this is how the virus spreads.

  3. Malware - Wikipedia

    en.wikipedia.org/wiki/Malware

    Malware (a portmanteau of malicious software) [1] is any software intentionally designed to cause disruption to a computer, server, client, or computer network, leak private information, gain unauthorized access to information or systems, deprive access to information, or which unknowingly interferes with the user's computer security and privacy.

  4. Computer worm - Wikipedia

    en.wikipedia.org/wiki/Computer_worm

    Computer viruses generally require a host program. The virus writes its own code into the host program. When the program runs, the written virus program is executed first, causing infection and damage. A worm does not need a host program, as it is an independent program or code chunk.

  5. Computer security - Wikipedia

    en.wikipedia.org/wiki/Computer_security

    Computer security, cybersecurity, digital security, or information technology security ( IT security) is the protection of computer systems and networks from attacks by malicious actors that may result in unauthorized information disclosure, theft of, or damage to hardware, software, or data, as well as from the disruption or misdirection of ...

  6. Zombie (computing) - Wikipedia

    en.wikipedia.org/wiki/Zombie_(computing)

    Zombie (computing) In computing, a zombie is a computer connected to the Internet that has been compromised by a hacker via a computer virus, computer worm, or trojan horse program and can be used to perform malicious tasks under the remote direction of the hacker. Zombie computers often coordinate together in a botnet controlled by the hacker ...

  7. Code injection - Wikipedia

    en.wikipedia.org/wiki/Code_injection

    Code injection is a class of computer security exploits in which a vulnerable computer program is tricked into misinterpreting external data as part of its code. An attacker thereby introduces (or "injects") code into the program and changes the course of its execution. The result of successful code injection can be disastrous, for example, by ...

  8. Ransomware - Wikipedia

    en.wikipedia.org/wiki/Ransomware

    Ransomware is a type of cryptovirological malware that permanently blocks access to the victim's personal data unless a ransom is paid. While some simple ransomware may lock the system without damaging any files, more advanced malware uses a technique called cryptoviral extortion. It encrypts the victim's files, making them inaccessible, and ...

  9. Computer crime countermeasures - Wikipedia

    en.wikipedia.org/wiki/Computer_crime_countermeasures

    Computer crime countermeasures. Cyber crime, or computer crime, refers to any crime that involves a computer and a network. [1] The computer may have been used in the commission of a crime, or it may be the target. Netcrime refers, more precisely, to criminal exploitation of the Internet. [2] Issues surrounding this type of crime have become ...

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