Fileless malware is a type of cyber threat that operates primarily in a computer's memory, rather than installing files on the hard drive. This approach allows it to evade traditional antivirus tools that scan for malicious files on disk. Fileless malware often exploits legitimate system tools or trusted applications to execute its payload, making detection and removal challenging. Because it leaves little to no trace on the system’s storage, it is harder for security software to identify and stop such attacks. Fileless malware is commonly used in sophisticated cyberattacks targeting both individuals and organizations.