Requirement 5: Protect all systems against malware and regularly update anti-virus software or programs
Malicious software, commonly referred to as “malware”—including viruses, worms, and Trojans—enters the network during many business- approved activities including employee e-mail and use of the Internet, mobile computers, and storage devices, resulting in the exploitation of system vulnerabilities. Anti-virus software must be used on all systems commonly affected by malware to protect systems from current and evolving malicious software threats. Additional anti-malware solutions may be considered as a supplement to the anti-virus software; however, such additional solutions do not replace the need for anti-virus software to be in place.