Malicious code is detected.

Centrally select and install malware detection and repair programs and update them regularly for preventive or regular scanning of computers and media.

Programs should check at least the following:

• files received over the network or storage media are scanned for malware before use
• email attachments and downloaded files are scanned for malware before use
• websites are scanned for malware

Malware protection systems automatically check for and install updates at desired intervals and also run the desired scans at the selected frequency without needed user actions.

The data systems (and their content) that support critical business processes are regularly reviewed to locate malware. All unauthorized files and changes will be formally investigated.

The organization must identify the types of websites that staff should and should not have access to.

The organization must consider blocking access to the following types of sites (either automatically or by other means):

• websites with a file upload function, unless this is permitted for a specific business need
• known or suspected malicious websites (e.g. distributing malware or containing phishing content)
• command and control servers
• websites distributing illegal content

We always use malware systems from multiple vendors to improve the likelihood of detecting malware.