Endpoint Detection and Response (EDR) is a practical, technical control that satisfies the intent of FAR 52.204-21 and CMMC 2.0 Level 1 requirement SI.L1-B.1.XIII by providing continuous endpoint visibility, basic detection capabilities, and the ability to collect and retain forensic telemetry—critical for protecting Controlled Unclassified Information (CUI) and demonstrating compliance.
What the Control Requires (Compliance Framework Context)
At Level 1, SI.L1-B.1.XIII expects organizations to implement basic safeguards and detection for endpoints that process or store federal information. For a Compliance Framework implementation this means: deploy an EDR agent on all scoped endpoints, ensure telemetry collection (processes, network connections, file writes, execution events), retain logs for an auditable period, and document configuration and monitoring processes. Key objectives are coverage, evidence of operation, and demonstrable ability to detect and respond to basic malicious activity.
Practical Implementation Steps
1) Scope and Asset Inventory
Begin with a current asset inventory: hostname, OS (Windows/macOS/Linux), owner, location, and whether the device processes CUI. A small business example: 25 employees, 30 endpoints (20 Windows, 7 macOS laptops, 3 Linux servers). Create a CSV that will be your deployment source-of-truth and attach it to your compliance evidence. For endpoints that are offline or unmanaged (e.g., contractor machines), record compensating controls or require enrollment before granting CUI access.
2) Select an EDR Solution and Mode (Self-managed vs MDR)
Choose based on platform support, telemetry retention, ease of deployment, and budget. For small businesses, managed detection and response (MDR) or EDR with SOC-lite services are often cost-effective. Required technical features: real-time process and network telemetry, cloud-based console with role-based access control, tamper protection for agents, and an API for export. Example vendors: CrowdStrike, Microsoft Defender for Endpoint, SentinelOne, and smaller managed providers. Get written evidence of feature sets (vendor datasheets) to map to control requirements.
3) Deployment Strategy
Use a phased rollout: pilot 5-10 machines (including admin and a few remote users), validate agent stability, then bulk-deploy via Intune/Group Policy/MDM or orchestration scripts (e.g., using PowerShell for Windows, Jamf for macOS, shell packages for Linux). Example commands: use Intune Win32 app or a PowerShell msiexec /i "EDRAgent.msi" /qn /norestart and verify agent heartbeat via vendor API (e.g., curl -H "Authorization: Bearer
4) Configuration, Tuning, and Integration
Configure baseline policies: enable telemetry collection (process create/exit, file create/modify, network connections), set retention (e.g., 90 days cloud storage as a baseline for Level 1 evidence), enforce tamper protection, and configure RBAC for console admins. For small shops, set automated containment to "alert and require analyst approval" for high-risk actions during the first 30 days to avoid business disruption. Integrate EDR with your SIEM (or central log storage) using the vendor API or syslog connectors; store a sample of forwarded events to prove log flow.
Operational Controls, Testing and Evidence
Operationalize by creating an incident playbook that references EDR console workflows (isolate host, collect forensic package, rollback quarantine). Test detection with safe exercises: run the EICAR test file, or use Atomic Red Team tests that simulate common techniques (e.g., lateral movement, credential dumping). Capture test logs and screenshots and include the test plan and results in your evidence package. Document retention policies, who has access to forensic artifacts, and incident triage time targets (e.g., initial triage within 1 business hour).
Risks of Not Implementing and Real-World Small Business Scenario
Without EDR you risk prolonged undetected compromise, data exfiltration, and loss of evidence required during an incident—exposing you to contract penalties under FAR and failing a CMMC assessment. Real-world example: a small subcontractor with a single unmanaged laptop experienced credential theft and lateral movement; without EDR they had no telemetry to confirm scope and took weeks to remove persistence, resulting in contract suspension. Implementing EDR earlier would have provided process execution logs and quick host isolation to contain the incident.
Compliance Tips and Best Practices
Document everything: asset lists, deployment logs, policy screenshots, detection test artifacts, and incident playbooks. Keep a change log for EDR policy changes and an approved whitelist for necessary exclusions (e.g., backups or legacy apps). Tune rules monthly to reduce false positives; for low-resource organizations, scripted weekly alerts and a single-point contact for triage can meet Level 1 intent. Use the vendor's secure API to export attestations of coverage and attach those exports to compliance evidence.
Summary: To meet FAR 52.204-21 and CMMC 2.0 Level 1 SI.L1-B.1.XIII, deploy an EDR that provides continuous telemetry, demonstrates coverage across scoped endpoints, documents configuration and monitoring processes, and proves incident detection/testing procedures. For small businesses, choose a solution or MDR partner that balances cost and operational capability, follow a phased deployment with documented tests, and keep clear, auditable evidence to support your compliance posture.
