During a routine check, you notice a process running with the name 'sysworker' consuming an unusually high amount of system resources on a server. This process is not documented in the company's list of standard applications or services. What is the MOST appropriate first step to take in determining if this process is legitimate or indicative of potential malware?
Isolate the server from the network to prevent potential lateral movement or contagion.
Restart the server to clear all running processes and reset the system to a known good state.
Review the server security logs and system configuration to correlate the process activity with any documented change or known application.
Immediately terminate the process to prevent potential damage or data loss.