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Monitor system accounts for [organization-defined] ;
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macOS post-exploitation for credential harvesting, DTrace monitoring, TCC bypass, and stealth operations via native tools
Windows userland post-exploitation for credential harvesting, monitoring, AMSI/ETW bypass, and stealth operations
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Based on SOC occupation classification
Showing SKILL.md
| name | AC-2(12)_account-monitoring-for-atypical-usage |
| description | Monitor system accounts for [organization-defined] ; |
| category | authorization |
| version | 5.2.0 |
| author | cyberstrike-official |
| tags | ["nist","sp800-53","rev5","ac-2-12","ac","enhancement"] |
| tech_stack | ["aws","azure","gcp","linux","windows"] |
| cwe_ids | ["CWE-284"] |
| chains_with | ["AU-6","AU-7","CA-7","IR-8","SI-4"] |
| prerequisites | ["AC-2"] |
| severity_boost | {"AU-6":"Chain with AU-6 for comprehensive security coverage","AU-7":"Chain with AU-7 for comprehensive security coverage","CA-7":"Chain with CA-7 for comprehensive security coverage"} |
Enhancement of: AC-2
Family: Access Control (AC) Framework: NIST SP 800-53 Rev 5
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.
Examine the System Security Plan (SSP) and related artifacts for AC-2(12) implementation details. Verify the organization has documented how this control is satisfied.
# For cloud environments, use cloud-audit-mcp tools
# For on-premises, review system configurations directly
# Example: Check if account management policies exist
grep -r "account.management\|access.control" /etc/security/ 2>/dev/null
Verify the control is actively functioning, not just documented. Check logs, configurations, and operational evidence.
| Tool | Purpose | Usage |
|---|---|---|
| cloud-audit-mcp | Check IAM policies and access controls | cloud_audit_iam_policies |
| hackbrowser-mcp | Test web application access controls | browser_auth_test |
Monitor system accounts for [organization-defined] ; and Report atypical usage of system accounts to [organization-defined].
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.
| Finding | Severity | Impact |
|---|---|---|
| AC-2(12) Account Monitoring for Atypical Usage not implemented | High | Access Control |
| AC-2(12) partially implemented | Medium | Incomplete Access Control |
| CWE ID | Title |
|---|---|
| CWE-284 | Improper Access Control |