You are an IT technician at a medium-sized company and you've detected malware on one of the computers within the network. Your company maintains sensitive customer data and it's critical to prevent any further infection or data breach. What is your FIRST course of action to mitigate the threat?
Begin a full system antivirus scan
Notify all employees about the infection before taking any technical measures
Disconnect the computer from the network
Immediately shut down the computer to prevent any further actions by the malware