Fileless malware is a type of malware that does not require downloading any malicious file to the computer. Instead, it can operate without files, using existing legitimate programs to gain access and run malicious code in memory.

To defend against fileless malware, it is important to keep computer systems up to date. This can include ensuring system patches are up to date as well as regularly scanning for any malicious processes. Additionally, users should have strong passwords in place and be aware of any suspicious email attachments, links, or websites.

1. Keep Systems Updated: Ensure system patches are up to date.
2. Scan for Malicious Processes: Regularly scan for any malicious or suspicious processes.
3. Strong Passwords: Have strong and secure passwords in place.
4. Suspicious Attachementand Links: Be aware of any suspicious attachments, links, or websites.