Microsoft Sentinel
by Microsoft
Covered
13
controls
Partial
2
controls
Gaps
3
controls
Overview
Microsoft Sentinel by Microsoft is a siem & logging solution that covers 13 NIST 800-171 controls (12% total coverage). It addresses key requirements in the siem & logging domain for defense contractors pursuing CMMC compliance.
Controls Covered (13)
Implementation Notes
Deploy Microsoft Sentinel with FIPS-validated configurations. Integrate with your SIEM for centralized audit logging. Review partial controls quarterly to identify supplementary tooling needs.
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Implementation Guidance for Microsoft Sentinel
Configure Microsoft Sentinel for NIST 800-171 compliance by implementing comprehensive log collection and analysis across your environment. For Access Control (AC) family requirements, enable Azure AD log ingestion and configure custom analytics rules to detect unauthorized access attempts, privilege escalations, and account anomalies. Set up workbooks to visualize access patterns and generate compliance reports. For Audit and Accountability (AU) controls, configure data connectors for Windows Security Events, Office 365, and network devices to ensure comprehensive audit log collection with proper retention periods (minimum 1 year). Create custom KQL queries to demonstrate audit review capabilities and automated alerting for security events. For System and Information Integrity (SI) requirements, deploy Microsoft Defender integration and configure threat intelligence feeds to identify malicious activities. Implement incident response playbooks using Sentinel's automation capabilities to demonstrate timely response to security incidents. Generate assessment evidence by creating custom workbooks that demonstrate log collection coverage, retention compliance, and incident response metrics. Export KQL query results and analytics rule configurations as evidence artifacts. Integrate Sentinel with Microsoft Defender for Endpoint, Azure Security Center, and third-party SIEM tools through data connectors. Common misconfigurations include insufficient log retention periods, missing critical data sources, inadequate analytics rule coverage, and failure to properly configure user entity behavior analytics (UEBA) for insider threat detection.
Gap Analysis & Compensating Controls
Microsoft Sentinel's 3 uncovered NIST controls likely fall within Configuration Management (CM), Media Protection (MP), and Physical Protection (PE) families, representing significant compliance gaps. The CM family gaps typically involve automated configuration monitoring and change control processes that require dedicated configuration management tools like Microsoft System Center Configuration Manager or third-party solutions such as Rapid7 InsightVM for vulnerability scanning and configuration assessment. For MP controls covering media sanitization and protection, implement specialized data loss prevention (DLP) tools like Microsoft Purview or Forcepoint DLP, along with certified media sanitization procedures using NIST 800-88 compliant tools. PE gaps require physical security controls that cannot be addressed through SIEM technology alone - implement physical access control systems, environmental monitoring, and visitor management solutions. Document these gaps in your System Security Plan (SSP) by clearly identifying the gap, proposed compensating controls, and implementation timeline. In your Plan of Action and Milestones (POA&M), prioritize CM gaps first as they carry the highest CMMC assessment weight and directly impact system hardening requirements. MP gaps should be addressed second due to their impact on controlled unclassified information (CUI) protection, while PE gaps can be addressed through administrative and physical controls with lower technical complexity.
Compliance Cost Estimate
Microsoft Sentinel licensing ranges from $2-15 per GB per month for data ingestion, with typical defense contractors spending $5,000-25,000 annually depending on log volume and retention requirements. Implementation costs include 40-80 hours of professional services ($8,000-20,000) for initial configuration, custom analytics rule development, and integration with existing security tools. Ongoing monitoring requires dedicated security analyst time (0.5-1.0 FTE) costing $50,000-100,000 annually. Compared to competitors like Splunk Enterprise Security ($2,000-5,000 per user annually) or IBM QRadar ($3,000-10,000 per user), Sentinel offers competitive pricing for cloud-native environments but may become expensive with high data volumes. The consumption-based pricing model provides flexibility but requires careful capacity planning to avoid budget overruns during security incidents or increased logging requirements.
Compliance Cross-References
Microsoft Sentinel directly supports DFARS 252.204-7012 requirements for incident reporting and cyber incident damage assessment by providing automated threat detection, incident response capabilities, and forensic analysis tools. For CMMC Level 2, Sentinel addresses multiple practice requirements across Access Control (AC.L2), Audit and Accountability (AU.L2), and System and Information Integrity (SI.L2) domains. Specifically, it satisfies AC.L2-3.1.1 through access logging and monitoring, AU.L2-3.3.1 through comprehensive audit log collection, and SI.L2-3.14.1 through malware detection and incident response capabilities. For FedRAMP Moderate controls, Sentinel provides native coverage for AU-2 (Audit Events), AU-3 (Content of Audit Records), AU-6 (Audit Review), IR-4 (Incident Handling), and SI-4 (Information System Monitoring). However, organizations must implement additional tools for configuration management (CM-2, CM-6), media protection (MP-6), and physical protection (PE-2, PE-3) controls to achieve full compliance. The CMMC assessment objectives satisfied include demonstrating continuous monitoring capabilities, incident response procedures, and audit log analysis, while requiring supplemental evidence for configuration baselines and physical security measures.
Frequently Asked Questions
How many NIST 800-171 controls does Microsoft Sentinel cover?
Microsoft Sentinel covers 13 of 110 NIST 800-171 controls (12%), with 2 partially covered and 3 gaps.
Can Microsoft Sentinel alone satisfy CMMC Level 2?
No single tool covers all 110 NIST 800-171 controls. Microsoft Sentinel covers 12% and should be part of a layered security stack addressing the remaining controls.
What controls does Microsoft Sentinel not cover?
Microsoft Sentinel does not cover controls mp-3-8-1, ia-3-5-1, pe-3-10-1. These require supplementary solutions such as physical security controls, additional access management, or media protection tools.
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