Fileless execution is a cyberattack technique where malicious code runs directly in a computer's memory without creating or modifying files on the disk. Attackers often exploit legitimate system tools, such as PowerShell or Windows Management Instrumentation (WMI), to execute harmful actions. Because no traditional files are stored, these attacks are difficult for standard antivirus software to detect. Fileless execution is increasingly popular among cybercriminals due to its stealth and effectiveness, making it a significant threat to both individuals and organizations.