NICECURL is a type of malware that infects computers by exploiting vulnerabilities in software or through social engineering tactics such as phishing emails or malicious websites. Once a computer is infected with NICECURL, it can steal sensitive information, disrupt system operations, and potentially allow attackers to gain unauthorized access to the infected machine. It is important for users to regularly update their software, use strong passwords, and be cautious when clicking on links or downloading attachments to prevent NICECURL infections.