Malware

What is Malware?

Malware is malicious software that can damage or destroy computers and steal data. It’s often created by cybercriminals, also known as hackers. 

Definitions

A program that is inserted into a system, usually covertly, with the intent of compromising the confidentiality, integrity, or availability of the victim’s data, applications, or operating system or of otherwise annoying or disrupting the victim.
SOURCE: SP 800-83

See Malicious Code. See also Malicious Applets and Malicious Logic.
SOURCE: SP 800-53; CNSSI-4009

A virus, worm, Trojan horse, or other code-based malicious entity that successfully infects a host.
SOURCE: SP 800-61

Other Definitions: Microsoft

Viruses

A well-known type of malware that can damage files, steal data, and slow down a device 

Worms

A type of malware that spreads quickly to devices on a network 

Spyware

A type of malware that gathers data from a user’s device and sends it to third parties without their consent 

Adware

A type of malware that displays unwanted advertisements on a device 

Ransomware

A type of malware that prevents a user from accessing their device and data by encrypting their files 

Rootkits

A type of malware that gives malicious actors remote control of a victim’s computer 

Botnets

A network of computers infected by malware that is controlled by a single attacking party 

Mobile malware

A type of malware designed to exploit vulnerabilities in mobile devices and operating systems