The Mirai botnet is known for scanning networks for vulnerabilities and default credentials to gain access to devices. Once infected, these devices can be used to launch attacks against other systems. Juniper advises users to not only update passwords but also to audit access logs for suspicious activity, implement firewalls to block unauthorized access, and keep their software updated. If a system is infected, Juniper recommends reimaging the system entirely because changes made by the malware are hard to detect.