AC-2(12)

Requirement
1. Monitor system accounts for [Assignment: organization-defined atypical usage]; and
2. Report atypical usage of system accounts to [Assignment: organization-defined personnel or roles].

Discussion

Atypical usage includes accessing systems at certain times of the day or from locations that are not consistent with the normal usage patterns of individuals. Monitoring for atypical usage may reveal rogue behavior by individuals or an attack in progress. Account monitoring may inadvertently create privacy risks since data collected to identify atypical usage may reveal previously unknown information about the behavior of individuals. Organizations assess and document privacy risks from monitoring accounts for atypical usage in their privacy impact assessment and make determinations that are in alignment with their privacy program plan.

NIST 800-53A Assessment Guidance

Examine

[SELECT FROM: Access control policy; procedures addressing account management; system design documentation; system configuration settings and associated documentation; system monitoring records; system audit records; audit tracking and monitoring reports; privacy impact assessment; system security plan; privacy plan; other relevant documents or records].

Interview

[SELECT FROM: Organizational personnel with account management responsibilities; system/network administrators; organizational personnel with information security responsibilities].

ID	Assessment Objectives
AC-02(12)(a)	system accounts are monitored for <AC-02(12)_ODP[01] atypical usage>;
AC-02(12)(b)	atypical usage of system accounts is reported to <AC-02(12)_ODP[02] personnel or roles>.

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