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https://docs.microsoft.com/.../security/threat-protection/intelligence/ransomware-malware

Ransomware is a type of malware that encrypts files and folders, preventing access to important files. Ransomware attempts to extort money from victims by asking for money, usually in form of cryptocurrencies, in exchange for the decryption key. But cybercriminals won't always follow through and unlock the files they encrypted.

https://docs.microsoft.com/.../security/threat-protection/intelligence/worms-malware

A worm is a type of malware that can copy itself and often spreads through a network by exploiting security vulnerabilities. It can spread through email attachments, text messages, file-sharing programs, social networking sites, network shares, removable drives, and software vulnerabilities. How worms work. Worms represent a large category of ...

https://www.microsoft.com/en-us/wdsi/threats

Learn about the world's most prevalent cyberthreats, including viruses and malware. Understand how they arrive, their detailed behaviors, infection symptoms, and how to prevent and remove them.

https://docs.microsoft.com/.../threat-protection/intelligence/prevent-malware-infection

Prevent malware infection. 12/30/2019; 6 minutes to read +4; In this article. Malware authors are always looking for new ways to infect computers. Follow the tips below to stay protected and minimize threats to your data and accounts.