Public sector organisations have been a recent favourite among criminal groups, with a number of cities in the US having paid out hundreds of thousands of dollars this year alone. It has proven to be one of the most popular forms of malware given its propensity to generate a high return on investment, particularly when 100% uptime is critical for the victim. These files are then returned to the user if they hand over a set amount of cash. Ransomware, as the name suggests, is a type of extortion malware that quietly breaks into a user's system with the goal of encrypting files. Ransomware has become one of the most well-known forms of malware out there, thanks to massive attacks like WannaCry in 2017. Keyloggers and screen readers are just two types of spyware that may infect your system. Unlike adware it hides its existence, silently syphoning off information. As the name would suggest, it spies on a user's activity and can exfiltrate sensitive data. Spyware, on the other hand, is malicious.
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