System And Information Integrity
Perform periodic scans of the information system and real-time scans of files from external sources as files are downloaded, opened, or executed.
Companies should use anti-malware software to scan and identify viruses in their computer systems, and have a plan for how often scans are conducted. Real-time scans will look at the system whenever new files are downloaded, opened, and saved. Periodic scans check previously saved files against updated malware information. Example While cleaning up your office, you find your old thumb drive. You are not sure if you should use it. Then you remember something: Your company just purchased anti-malware software that auto-updates with the latest antivirus code and definitions of all known malware. With this in mind, you decide to plug in the thumb drive. The new anti-malware software scans the thumb drive, finds a virus, then deletes the file.
Perform periodic scans of organizational systems and real-time scans of files from external sources as files are downloaded, opened, or executed.
Periodic scans of organizational systems and real-time scans of files from external sources can detect malicious code. Malicious code can be encoded in various formats (e.g., UUENCODE, Unicode), contained within compressed or hidden files, or hidden in files using techniques such as steganography. Malicious code can be inserted into systems in a variety of ways including web accesses, electronic mail, electronic mail attachments, and portable storage devices. Malicious code insertions occur through the exploitation of system vulnerabilities.
CIS Controls v7.1 8.4, 8.7
NIST SP 800-53 Rev 4 SI-3
NIST CSF v1.1 DE.CM-4
NIST SP 800-171 Rev 1 3.14.5
FAR Clause 52.204-21 b.1.xv
CERT RMM v1.2 VAR:SG3.SP1
SI.1.213.[a] the frequency for malicious code scans is defined;
SI.1.213.[b] malicious code scans are performed with the defined frequency; and
SI.1.213.[c] real-time malicious code scans of files from external sources as files are downloaded, opened, or executed are performed.