SI.L2-3.14.7 Identify Unauthorized Use

Identify unauthorized use of organizational systems.

Source: NIST SP 800-171 Rev 2 3.14.7

Discussion: System monitoring includes external and internal monitoring. System monitoring can detect unauthorized use of organizational systems. System monitoring is an integral part of continuous monitoring and incident response programs. Monitoring is achieved through a variety of tools and techniques (e.g., intrusion detection systems, intrusion prevention systems, malicious code protection software, scanning tools, audit record monitoring software, network monitoring software). Output from system monitoring serves as input to continuous monitoring and incident response programs. Unusual/unauthorized activities or conditions related to inbound and outbound communications traffic include internal traffic that indicates the presence of malicious code in systems or propagating among system components, the unauthorized exporting of information, or signaling to external systems. Evidence of malicious code is used to identify potentially compromised systems or system components. System monitoring requirements, including the need for specific types of system monitoring, may be referenced in other requirements. [SP 800-94] provides guidance on intrusion detection and prevention systems.

Assessment Objectives:

Determine if:

• [a] authorized use of the system is defined; and
• [b] unauthorized use of the system is identified.

Examine: [SELECT FROM: Continuous monitoring strategy; system and information integrity policy; procedures addressing system monitoring tools and techniques; facility diagram/layout; security plan; system design documentation; system monitoring tools and techniques documentation; locations within system where monitoring devices are deployed; system configuration settings and associated documentation; other relevant documents or records].

Interview: [SELECT FROM: System or network administrators; personnel with information security responsibilities; personnel installing, configuring, and maintaining the system; personnel with responsibility for monitoring the system].

Test: [SELECT FROM: Organizational processes for system monitoring; mechanisms supporting or implementing system monitoring capability].

SPRS Score: 3

POA&M Allowed: No