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Written by Oleksandr Gavenko (AKA gavenkoa), compiled on 2018-02-10 from rev 9e6ad6607a9e.


About malware

Malware (malicious software) is software designed to infiltrate a computer system without the owner's informed consent.


Program that has infected some executable software and that causes that software, when run, to spread the virus to other executable software.



Worm is a program that actively transmits itself over a network to infect other computers.

Worms may also contain a payload that performs other actions, often malicious.

Trojan horses




Rootkit is a program which modifying the host operating system so that the malware is hidden from the user.

Rootkits can prevent a malicious process from being visible.





The presence of spyware is typically hidden from the user.

Sometimes, spywares such as keyloggers are installed by the owner of a shared, corporate or public computer on purpose in order to secretly monitor other users.




Keystroke loggers

Malware programs install a key logger, which intercepts the user's keystrokes when entering a password, credit card number, or other information that may be exploited. These are then transmitted to the malware creator.


Electronic device that is connected to a telephone line to monitor the dialed numbers and alter them to seamlessly provide services that otherwise require lengthy access codes to be dialed.

Screen scrapers