Asuka is a type of malware, specifically a trojan horse virus, that infects computers and can cause harm to the system. It is typically spread through malicious email attachments, fake software downloads, or compromised websites. Once a computer is infected with Asuka, it can steal sensitive information, such as passwords and financial data, and give hackers remote access to the infected system. It is important for computer users to have up-to-date antivirus software and to be cautious when opening email attachments or downloading files from unknown sources to prevent infection from malware like Asuka.